regulusn.

Brit.

/ˈrɛɡjᵿləs/, U.S.

/ˈrɛɡjələs/

Inflections: Plural reguli

/ˈrɛɡjʊlaɪ/.

Origin: A borrowing from Latin. Etymon: Latin rēgulus.

Etymology: < classical Latin rēgulus king ruling over a small territory, petty king, chieftain, in post-classical Latin also wren (from 1159 in British sources), brightest star in the constellation Leo (1543 in Copernicus De revolutionibus orbium coelestium, or perhaps earlier), metallic form of antimony (1575 in antimonii regulus regulus of antimony, or earlier) < rēg- , rēx king (see rex n.¹) + -ulus -ulus suffix. Some senses of the Latin word may be after corresponding senses of ancient Greek βασιλίσκος basilisk n. Sense 5 may show an independent origin; compare classical Latin rēgula regula n., and also ruler n.¹ 3.Classical Latin rēgulus is intermittently attested in the sense ‘petty king’ in British sources from the late 8th cent. to the 15th cent., sometimes used disparagingly. With sense 2 compare classical Latin stella rēgia (Pliny), literally ‘kingly star’, in the same sense. In sense 3a, the precise semantic motivation for the name is unclear. Suggestions include that the metallic form of antimony was so called because it combined readily with gold, the ‘king’ of metals; that it was taken as the ‘firstborn child’ of the ‘royal blood’ of metals, being similar, but at the same time inferior, to other metals; that it was so called because it was silvery-white in colour, and hence resembled silver, the second most precious metal after gold; and that it was so called because it was considered a substance of special value. Compare French †régule d'antimoine (1611 in Cotgrave as †regule d'antimonie ; < Latin), and also German (now hist.) König (a1541 in this sense in Paracelsus; usually as second element of compounds, the first element being the name of a specific metal; transferred use of König king n.). In plural form reguli after the Latin plural form.

1. A petty king or ruler; a sub-king. Now historical.In quot. 1641 perhaps punning on the use of regulus by classical writers to refer to the common wren; cf. sense 4a.

ΘΚΠ

society > authority > rule or government > ruler or governor > sovereign ruler or monarch > king > [noun] > petty king

regulusa1513

roitelet?1592

kinglet1603

kingling1605

toparch1640

royalet1650

roylet1658

a1513 R. Fabyan New Cronycles Eng. & Fraunce (1516) I. v. xci. f. xxxvi This Hengiste and all the other Saxons whyche ruled the .vii. pryncipates of Brytayne..are called of moste wryters reguli whyche is to meane in oure vulgare or speche as small or lytell kynges.

1641 T. Widdrington Speech 20 July in W. Prynne Antipathie 283 You see by this Parlamentary impeachment what a Regulus, Tyrant, and Serpent this Wren hath beene.

1682 T. Amy Carolina 36 They are divided into many Divisions or Nations, Govern'd by Reguli, or Petty Princes, which our English call Cacicoes.

1728 E. Chambers Cycl. (at cited word) In the Archives of the Cathedral of Worcester, Uthredus, sometimes stiles himself Regulus, and sometimes Sub-regulus of the City of Worcester.

1807 G. Chalmers Caledonia I. ii. ii. 238 A very strong hill-fort..formed a secure residence for their reguli.

1867 J. H. Burton Hist. Scotl. to 1688 I. i. 5 Agricola cultivated the acquaintance of a certain Regulus, prince or chief of Ireland, driven forth by political animosities.

1908 S. Baring-Gould & J. Fisher Lives Brit. Saints II. 205 Edelig was the regulus of the district.

1989 Scottish Field May 49/1 Somerled, King of the Hebrides, Regulus (sub-king or viceroy) of Argyll.

1996 E. John Reassessing Anglo-Saxon Eng. 53 One of Offa's first appearances in a charter is as a witness to a charter by which Eanberht, regulus of the Hwicce, granted privileges to Bishop Mildred of Worcester.

2. Astronomy. Usually with capital initial. The brightest star in the constellation Leo (α Leonis), now recognized to be a double binary system of which the primary (Regulus A) is a blue-white main sequence star.

ΘΚΠ

the world > the universe > star > kind of star > small star > [noun] > dwarf > Regulus

basilisk1556

regulus1559

1559 W. Cuningham Cosmogr. Glasse 108 Then I find by that obseruation, the Mone to differ from regulus, j. degree .43. min.

1653 R. Gentilis tr. F. Bacon Nat. & Exper. Hist. Winds 260 Amongst the fixed starres, the hottest is that is called Sirius, then the Lion's heart, or Regulus, then the Dog-starre, &c.

1728 E. Chambers Cycl. (at cited word) The Longitude of Regulus, as fix'd by Mr. Flamsteed, is 25°, 31′, 20″.

1868 W. Lockyer & J. N. Lockyer tr. A. Guillemin Heavens (ed. 3) 325 It is at the lower extremity..that Regulus, a star of the first magnitude,..shines.

1889 C. R. Markham tr. R. Hues Treat. Globes 219 The lunar distances of Regulus are given in the Nautical Almanac.

1964 P. Moore Yearbk. Astron. 1965 52 Hydra has only one bright star... It also lies in line with the end star of the Great Bear (Alkaid) and Regulus in Leo.

2002 Times 1 July 32/3 Venus..will be close to the bright star Regulus in Leo on the 10th and near the Moon on the 13th.

a. More fully regulus of antimony. The metallic form of antimony. Now chiefly historical.

ΘΚΠ

the world > matter > chemistry > elements and compounds > metals > specific elements > antimony > [noun]

antimony1477

regulus1594

1594 H. Plat Diuers Chimicall Concl. Distillation 45 in Jewell House Mixed with the Regulus of Antimonie.

1649 C. Culpeper Let. 19 July in 17th-cent. Polit. & Financial Papers (1996) 353 I pray inquire what you can whether the Antimony Cup & the Regulus of Antimony be the same; yf..you finde it soe, I heartily wishe, for a proportion of the Regulus.

1651 J. French Art Distillation iii. 72 Take of the subtile powder of the Regulus of Antimony as much as you please.

1651 R. Wittie tr. J. Primrose Pop. Errours 455 The Antimoniall Cup, or the Regulus out of which it is made.

1661 R. Boyle Two Ess. Unsuccessfulness Exper. i, in Certain Physiol. Ess. 50 My own Laboratory has afforded me divers such parcels of Regulus without Mars.

1744 G. Berkeley Siris (ESTC T72826) §169 Four ounces of regulus of antimony being calcined by a burning-glass.

1868 F. H. Joynson Metals in Constr. 107 Then add 8 oz. regulus antimony.

1922 Mineral Industry 30 36 Under the present act antimony regulus, or metal, pays an import duty of 10 per cent.

1994 W. R. Newman Gehennical Fire iv. 129 In doing so he is to arrive at the famous ‘star regulus’ of antimony, the striking star-like formation of metallic antimony that sometimes occurs when the molten metal is cooled slowly under a covering of slag.

b. Metallurgy. The purer or more metallic part of a mineral, which sinks to the bottom of a crucible or furnace and is thereby separated out. Hence: metal separated from a mineral or ore by smelting or reduction, as the first stage of purification.

ΘΚΠ

society > occupation and work > materials > raw material > mineral material > ore > [noun] > purer metallic part

regulus1651

head1832

society > occupation and work > materials > raw material > mineral material > ore > [noun] > product of smelting

regulus1709

regule1778

1651 J. French tr. J. R. Glauber Descr. New Philos. Furnaces 247 Which done you must precipitate new tin in the foresaid Furnace, and so extract to the remainder of the Regulus which extract again.

1678 Philos. Trans. 1677 (Royal Soc.) 12 953 The first regulus of Gold being separated from the Antimony, both were powdered apart.

1709 Philos. Trans. 1708–09 (Royal Soc.) 26 379 Iron deprived of this sulphurous part, melts into a Regulus.

1796 R. Kirwan Elements Mineral. (ed. 2) II. 454 The purest Regulus of Nickel.

1825 ‘J. Nicholson’ Operative Mechanic 757 There is a great difference in the reguli of iron.

1868 F. H. Joynson Metals in Constr. 97 The metal [is] run into pigs, in the state known technically as ‘coarse metal’, or, more generally ‘regulus’.

1874 R. W. Raymond Statistics Mines & Mining 306 Yielding a regulus assaying 30 per cent. of copper.

1924 A. J. Allmand & H. J. T. Ellingham Princ. Appl. Electrochem. (ed. 2) xxi. 515 The precipitated metal will not coalesce to form a regulus.

1997 T. Pynchon Mason & Dixon 548 The Valleys were lit with many small fires, at each of which Ore was being burn'd to a Regulus of the Metal.

2003 Minerals Engin. 16 802/1 The vanadium regulus obtained by either method may then be purified further by means of electron-beam melting.

†a. The common wren, Troglodytes troglodytes. Obsolete.

ΘΚΠ

the world > animals > birds > order Passeriformes (singing) > non-arboreal (larks, etc.) > [noun] > family Troglodytidae > genus Troglodytes > species troglodytes (wren)

wrenc725

little kingc1450

Our Lady's hena1529

jenny wren1648

regulus1678

tope1813

staga1825

kitty1825

feather-poke1831

robin1837

robin redbreasta1873

jenny1881

St. Kilda wren1884

1572 J. Higgins Huloets Dict. (rev. ed.) Wrenne, a byrde. [Latin] Regulus.]

1678 J. Ray tr. F. Willughby Ornithol. ii. xiii. 229 The Wren, Passer troglodites of Aldrovand, by Turner and Bellonius called falsly Regulus... All the Modern Writers of the History of birds before Gesner take this bird to be the Regulus of the Ancients.

1706 Phillips's New World of Words (new ed.) Regulus,..also a little Bird call'd a Wren.

b. A bird of the genus Regulus (family Regulidae), a kinglet; esp. a goldcrest or a firecrest; now rare. Also (in form Regulus): the genus itself.The genus Regulus formerly also included the leaf warblers, which are now assigned to the genus Phylloscopus (family Sylviidae).Valid publication of the genus name: Cuvier Leçons d'anat. comparée (1800) I. tab. 2.

ΘΚΠ

the world > animals > birds > order Passeriformes (singing) > family Muscicapidae (thrushes, etc.) > subfamily Sylviidae (warbler) > [noun] > genus Regulus > regulus regulus (goldcrest)

yellowbird1625

regulus1750

basilisk1753

marigold bird1772

nettle creeper1772

goldcrest1819

marigold finch1828

kinglet1835

woodcock pilot1871

thumb bird1885

tot-o'er-seas1885

herring spink1906

pope's eye1965

the world > animals > birds > order Passeriformes (singing) > family Muscicapidae (thrushes, etc.) > subfamily Sylviidae (warbler) > [noun] > genus Regulus > regulus ignicapillus (fire-crest)

firecrest1834

fire-crested wren1835

regulus1851

1750 C. Smith Antient & Present State Cork II. 335 The Regulus or crested wren..is a smaller bird.

1755 New & Compl. Dict. Arts & Sci. IV. 2698/2 Regulus, in ornithology, the name of several birds of the motacilla-kind, as, 1. The crested regulus, about the size of the common wren... 2. The yellow wasted, greyish green regulus, without a crest.

1797 Encycl. Brit. XII. 398/1 The regulus, or gold-crested wren, is a native of Europe.

1824 Mem. Wernerian Nat. Hist. Soc. 5 400 I have not yet ascertained whether the Reguli of the southern parts of England were likewise observed to migrate.

1851 Rural Cycl. (at cited word) The fire-crested regulus, R. ignicapillus, is not so common as the preceding species, and is about half an inch longer.

1920 Edinb. Rev. Jan. 72 The hedge sparrow and golden-crested wren, the former of which is..an accentor, and the latter a regulus.

2001 Bird Keeper Feb. 5/1 Among the group of birds known as the ‘Old World warblers’ is the small family of kinglets of the Regulus genus.

5. Geometry. A ruled surface; the surface swept out by a straight line which moves such that it never crosses its own path.

ΘΚΠ

the world > relative properties > number > geometry > surface > [noun]

superficec1400

superficies1530

surface1604

superficie1702

wave-surface1833

developable1847

quartic1854

scroll1862

conicoid1863

regulus1874

Riemann surface1876

tetrahedroid1889

construct1902

skew1902

trend surface1956

1874 G. Salmon Treat. Analytic Geom. Three Dimensions (ed. 3) xii. 406 We have here a ‘regulus’ of lines or ruled-surface.

1910 O. Veblen & J. W. Young Projective Geom. I. xi. 299 No two lines of a regulus can intersect, for otherwise two of the directrices would lie in a plane.

1961 Math. Gaz. 45 29 By choosing different values of θ the points at which the different lines of each regulus meet π₁ and π₂ can be found.

2005 J. M. Selig Geom. Fund. Robots (ed. 2) vi. 124 Since the quadric is two-dimensional the linear subspaces are lines. Each family is a ruled surface called a regulus.

Compounds

regulus metal n. Metallurgy an alloy of lead and antimony which contains at least 75 per cent lead.

ΚΠ

1879 G. Lunge Theoret. & Pract. Treat. Manuf. Sulphuric Acid I. 297 It carries in its bottom a valve-seat a of regulus metal, into which fits a conical plug.

1938 R. Hum Chem. for Engin. Students xviii. 484 The product, called regulus metal, has the great advantage, compared with lead, of being hard, and able to withstand considerable mechanical strain.

2002 G. S. Brady et al. Materials Handbk. ii. 528 The alloy is also known as hard lead, and in England it is called regulus metal.

This entry has been updated (OED Third Edition, December 2009; most recently modified version published online March 2022).

单词	regulus
释义	regulusn. Brit. /ˈrɛɡjᵿləs/, U.S. /ˈrɛɡjələs/ Inflections: Plural reguli /ˈrɛɡjʊlaɪ/. Origin: A borrowing from Latin. Etymon: Latin rēgulus. Etymology: < classical Latin rēgulus king ruling over a small territory, petty king, chieftain, in post-classical Latin also wren (from 1159 in British sources), brightest star in the constellation Leo (1543 in Copernicus De revolutionibus orbium coelestium, or perhaps earlier), metallic form of antimony (1575 in antimonii regulus regulus of antimony, or earlier) < rēg- , rēx king (see rex n.¹) + -ulus -ulus suffix. Some senses of the Latin word may be after corresponding senses of ancient Greek βασιλίσκος basilisk n. Sense 5 may show an independent origin; compare classical Latin rēgula regula n., and also ruler n.¹ 3.Classical Latin rēgulus is intermittently attested in the sense ‘petty king’ in British sources from the late 8th cent. to the 15th cent., sometimes used disparagingly. With sense 2 compare classical Latin stella rēgia (Pliny), literally ‘kingly star’, in the same sense. In sense 3a, the precise semantic motivation for the name is unclear. Suggestions include that the metallic form of antimony was so called because it combined readily with gold, the ‘king’ of metals; that it was taken as the ‘firstborn child’ of the ‘royal blood’ of metals, being similar, but at the same time inferior, to other metals; that it was so called because it was silvery-white in colour, and hence resembled silver, the second most precious metal after gold; and that it was so called because it was considered a substance of special value. Compare French †régule d'antimoine (1611 in Cotgrave as †regule d'antimonie ; < Latin), and also German (now hist.) König (a1541 in this sense in Paracelsus; usually as second element of compounds, the first element being the name of a specific metal; transferred use of König king n.). In plural form reguli after the Latin plural form. 1. A petty king or ruler; a sub-king. Now historical.In quot. 1641 perhaps punning on the use of regulus by classical writers to refer to the common wren; cf. sense 4a. ΘΚΠ society > authority > rule or government > ruler or governor > sovereign ruler or monarch > king > [noun] > petty king regulusa1513 roitelet?1592 kinglet1603 kingling1605 toparch1640 royalet1650 roylet1658 a1513 R. Fabyan New Cronycles Eng. & Fraunce (1516) I. v. xci. f. xxxvi This Hengiste and all the other Saxons whyche ruled the .vii. pryncipates of Brytayne..are called of moste wryters reguli whyche is to meane in oure vulgare or speche as small or lytell kynges. 1641 T. Widdrington Speech 20 July in W. Prynne Antipathie 283 You see by this Parlamentary impeachment what a Regulus, Tyrant, and Serpent this Wren hath beene. 1682 T. Amy Carolina 36 They are divided into many Divisions or Nations, Govern'd by Reguli, or Petty Princes, which our English call Cacicoes. 1728 E. Chambers Cycl. (at cited word) In the Archives of the Cathedral of Worcester, Uthredus, sometimes stiles himself Regulus, and sometimes Sub-regulus of the City of Worcester. 1807 G. Chalmers Caledonia I. ii. ii. 238 A very strong hill-fort..formed a secure residence for their reguli. 1867 J. H. Burton Hist. Scotl. to 1688 I. i. 5 Agricola cultivated the acquaintance of a certain Regulus, prince or chief of Ireland, driven forth by political animosities. 1908 S. Baring-Gould & J. Fisher Lives Brit. Saints II. 205 Edelig was the regulus of the district. 1989 Scottish Field May 49/1 Somerled, King of the Hebrides, Regulus (sub-king or viceroy) of Argyll. 1996 E. John Reassessing Anglo-Saxon Eng. 53 One of Offa's first appearances in a charter is as a witness to a charter by which Eanberht, regulus of the Hwicce, granted privileges to Bishop Mildred of Worcester. 2. Astronomy. Usually with capital initial. The brightest star in the constellation Leo (α Leonis), now recognized to be a double binary system of which the primary (Regulus A) is a blue-white main sequence star. ΘΚΠ the world > the universe > star > kind of star > small star > [noun] > dwarf > Regulus basilisk1556 regulus1559 1559 W. Cuningham Cosmogr. Glasse 108 Then I find by that obseruation, the Mone to differ from regulus, j. degree .43. min. 1653 R. Gentilis tr. F. Bacon Nat. & Exper. Hist. Winds 260 Amongst the fixed starres, the hottest is that is called Sirius, then the Lion's heart, or Regulus, then the Dog-starre, &c. 1728 E. Chambers Cycl. (at cited word) The Longitude of Regulus, as fix'd by Mr. Flamsteed, is 25°, 31′, 20″. 1868 W. Lockyer & J. N. Lockyer tr. A. Guillemin Heavens (ed. 3) 325 It is at the lower extremity..that Regulus, a star of the first magnitude,..shines. 1889 C. R. Markham tr. R. Hues Treat. Globes 219 The lunar distances of Regulus are given in the Nautical Almanac. 1964 P. Moore Yearbk. Astron. 1965 52 Hydra has only one bright star... It also lies in line with the end star of the Great Bear (Alkaid) and Regulus in Leo. 2002 Times 1 July 32/3 Venus..will be close to the bright star Regulus in Leo on the 10th and near the Moon on the 13th. 3. a. More fully regulus of antimony. The metallic form of antimony. Now chiefly historical. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > antimony > [noun] antimony1477 regulus1594 1594 H. Plat Diuers Chimicall Concl. Distillation 45 in Jewell House Mixed with the Regulus of Antimonie. 1649 C. Culpeper Let. 19 July in 17th-cent. Polit. & Financial Papers (1996) 353 I pray inquire what you can whether the Antimony Cup & the Regulus of Antimony be the same; yf..you finde it soe, I heartily wishe, for a proportion of the Regulus. 1651 J. French Art Distillation iii. 72 Take of the subtile powder of the Regulus of Antimony as much as you please. 1651 R. Wittie tr. J. Primrose Pop. Errours 455 The Antimoniall Cup, or the Regulus out of which it is made. 1661 R. Boyle Two Ess. Unsuccessfulness Exper. i, in Certain Physiol. Ess. 50 My own Laboratory has afforded me divers such parcels of Regulus without Mars. 1744 G. Berkeley Siris (ESTC T72826) §169 Four ounces of regulus of antimony being calcined by a burning-glass. 1868 F. H. Joynson Metals in Constr. 107 Then add 8 oz. regulus antimony. 1922 Mineral Industry 30 36 Under the present act antimony regulus, or metal, pays an import duty of 10 per cent. 1994 W. R. Newman Gehennical Fire iv. 129 In doing so he is to arrive at the famous ‘star regulus’ of antimony, the striking star-like formation of metallic antimony that sometimes occurs when the molten metal is cooled slowly under a covering of slag. b. Metallurgy. The purer or more metallic part of a mineral, which sinks to the bottom of a crucible or furnace and is thereby separated out. Hence: metal separated from a mineral or ore by smelting or reduction, as the first stage of purification. ΘΚΠ society > occupation and work > materials > raw material > mineral material > ore > [noun] > purer metallic part regulus1651 head1832 society > occupation and work > materials > raw material > mineral material > ore > [noun] > product of smelting regulus1709 regule1778 1651 J. French tr. J. R. Glauber Descr. New Philos. Furnaces 247 Which done you must precipitate new tin in the foresaid Furnace, and so extract to the remainder of the Regulus which extract again. 1678 Philos. Trans. 1677 (Royal Soc.) 12 953 The first regulus of Gold being separated from the Antimony, both were powdered apart. 1709 Philos. Trans. 1708–09 (Royal Soc.) 26 379 Iron deprived of this sulphurous part, melts into a Regulus. 1796 R. Kirwan Elements Mineral. (ed. 2) II. 454 The purest Regulus of Nickel. 1825 ‘J. Nicholson’ Operative Mechanic 757 There is a great difference in the reguli of iron. 1868 F. H. Joynson Metals in Constr. 97 The metal [is] run into pigs, in the state known technically as ‘coarse metal’, or, more generally ‘regulus’. 1874 R. W. Raymond Statistics Mines & Mining 306 Yielding a regulus assaying 30 per cent. of copper. 1924 A. J. Allmand & H. J. T. Ellingham Princ. Appl. Electrochem. (ed. 2) xxi. 515 The precipitated metal will not coalesce to form a regulus. 1997 T. Pynchon Mason & Dixon 548 The Valleys were lit with many small fires, at each of which Ore was being burn'd to a Regulus of the Metal. 2003 Minerals Engin. 16 802/1 The vanadium regulus obtained by either method may then be purified further by means of electron-beam melting. 4. †a. The common wren, Troglodytes troglodytes. Obsolete. ΘΚΠ the world > animals > birds > order Passeriformes (singing) > non-arboreal (larks, etc.) > [noun] > family Troglodytidae > genus Troglodytes > species troglodytes (wren) wrenc725 little kingc1450 Our Lady's hena1529 jenny wren1648 regulus1678 tope1813 staga1825 kitty1825 feather-poke1831 robin1837 robin redbreasta1873 jenny1881 St. Kilda wren1884 1572 J. Higgins Huloets Dict. (rev. ed.) Wrenne, a byrde. [Latin] Regulus.] 1678 J. Ray tr. F. Willughby Ornithol. ii. xiii. 229 The Wren, Passer troglodites of Aldrovand, by Turner and Bellonius called falsly Regulus... All the Modern Writers of the History of birds before Gesner take this bird to be the Regulus of the Ancients. 1706 Phillips's New World of Words (new ed.) Regulus,..also a little Bird call'd a Wren. b. A bird of the genus Regulus (family Regulidae), a kinglet; esp. a goldcrest or a firecrest; now rare. Also (in form Regulus): the genus itself.The genus Regulus formerly also included the leaf warblers, which are now assigned to the genus Phylloscopus (family Sylviidae).Valid publication of the genus name: Cuvier Leçons d'anat. comparée (1800) I. tab. 2. ΘΚΠ the world > animals > birds > order Passeriformes (singing) > family Muscicapidae (thrushes, etc.) > subfamily Sylviidae (warbler) > [noun] > genus Regulus > regulus regulus (goldcrest) yellowbird1625 regulus1750 basilisk1753 marigold bird1772 nettle creeper1772 goldcrest1819 marigold finch1828 kinglet1835 woodcock pilot1871 thumb bird1885 tot-o'er-seas1885 herring spink1906 pope's eye1965 the world > animals > birds > order Passeriformes (singing) > family Muscicapidae (thrushes, etc.) > subfamily Sylviidae (warbler) > [noun] > genus Regulus > regulus ignicapillus (fire-crest) firecrest1834 fire-crested wren1835 regulus1851 1750 C. Smith Antient & Present State Cork II. 335 The Regulus or crested wren..is a smaller bird. 1755 New & Compl. Dict. Arts & Sci. IV. 2698/2 Regulus, in ornithology, the name of several birds of the motacilla-kind, as, 1. The crested regulus, about the size of the common wren... 2. The yellow wasted, greyish green regulus, without a crest. 1797 Encycl. Brit. XII. 398/1 The regulus, or gold-crested wren, is a native of Europe. 1824 Mem. Wernerian Nat. Hist. Soc. 5 400 I have not yet ascertained whether the Reguli of the southern parts of England were likewise observed to migrate. 1851 Rural Cycl. (at cited word) The fire-crested regulus, R. ignicapillus, is not so common as the preceding species, and is about half an inch longer. 1920 Edinb. Rev. Jan. 72 The hedge sparrow and golden-crested wren, the former of which is..an accentor, and the latter a regulus. 2001 Bird Keeper Feb. 5/1 Among the group of birds known as the ‘Old World warblers’ is the small family of kinglets of the Regulus genus. 5. Geometry. A ruled surface; the surface swept out by a straight line which moves such that it never crosses its own path. ΘΚΠ the world > relative properties > number > geometry > surface > [noun] superficec1400 superficies1530 surface1604 superficie1702 wave-surface1833 developable1847 quartic1854 scroll1862 conicoid1863 regulus1874 Riemann surface1876 tetrahedroid1889 construct1902 skew1902 trend surface1956 1874 G. Salmon Treat. Analytic Geom. Three Dimensions (ed. 3) xii. 406 We have here a ‘regulus’ of lines or ruled-surface. 1910 O. Veblen & J. W. Young Projective Geom. I. xi. 299 No two lines of a regulus can intersect, for otherwise two of the directrices would lie in a plane. 1961 Math. Gaz. 45 29 By choosing different values of θ the points at which the different lines of each regulus meet π₁ and π₂ can be found. 2005 J. M. Selig Geom. Fund. Robots (ed. 2) vi. 124 Since the quadric is two-dimensional the linear subspaces are lines. Each family is a ruled surface called a regulus. Compounds regulus metal n. Metallurgy an alloy of lead and antimony which contains at least 75 per cent lead. ΚΠ 1879 G. Lunge Theoret. & Pract. Treat. Manuf. Sulphuric Acid I. 297 It carries in its bottom a valve-seat a of regulus metal, into which fits a conical plug. 1938 R. Hum Chem. for Engin. Students xviii. 484 The product, called regulus metal, has the great advantage, compared with lead, of being hard, and able to withstand considerable mechanical strain. 2002 G. S. Brady et al. Materials Handbk. ii. 528 The alloy is also known as hard lead, and in England it is called regulus metal. This entry has been updated (OED Third Edition, December 2009; most recently modified version published online March 2022). < n.a1513
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