semicirclen.

/ˈsɛmɪsəːk(ə)l/

Etymology: < Latin sēmicirculus: see semi- prefix 2b(b) and circle n.

1. The half of a circle divided by a diameter, or the half of its circumference.

ΘΚΠ

the world > space > shape > curvature > roundness > [noun] > circularity > semicircularity > semicircle

semicircle1526

half-circle1552

hemicircle1603

hemicycle1603

demi-circle1654

semicirque1814

binant1938

1526 C. Mery Talys sig. Aiv^v [Oxford scholar speaking] Cobler I praye the sette [cut off: me two tr]yangyls and two semy cercles vpon my subpedytales.

1551 R. Record Pathway to Knowl. i. Defin. If that part be separate from the rest of the circle..And if it be parted juste by the centre..then is it called a semicircle, or halfe compasse.

?a1560 L. Digges Geom. Pract.: Pantometria (1571) i. Defs. sig. B ij A Semicircle or halfe Circle, doth conteine both the Dimetient and Centre of his circle, with the precise halfe of his circumference.

1610 P. Holland tr. W. Camden Brit. i. 208 A very antient towne..situat amidst hilles in forme of a semicircle.

?1677 S. Primatt City & Covntry Purchaser & Builder 164 The measuring of a Semi~circle, is the multiplying half the Diameter..by a quarter of the Circle.

1798 C. Hutton Course Math. I. 301 An Angle in a Semicircle, is a Right Angle.

2. A set of objects or an arrangement in the form of a half-circle; a semicircular form, formation, structure, etc.

ΘΚΠ

the world > space > shape > curvature > roundness > [noun] > circularity > semicircularity > semicircle > semicircular formation

semicircle1598

1598 A. M. tr. J. Guillemeau Frenche Chirurg. 27/1 We must file of all such teeth which will not be contayned in the semicircle of the other teeth.

a1637 B. Jonson Eng. Gram. ii. i, in Wks. (1640) III Apostrophus..should, and of the learneder sort hath his signe and marke, which is such a Semicircle ' placed in the top.

1704 Clarendon's Hist. Rebellion III. xv. 470 The smaller Ships..lay in a Semicircle, moor'd along the Shore.

1726 J. Swift Gulliver I. i. i. 24 The Chains..gave me..the Liberty of walking backwards and forwards in a Semicircle.

1817 P. B. Shelley Laon & Cythna i. v. 3 The pallid semicircle of the moon.

1831 in Jrnl. Frankl. Inst. VIII. (N.S.) 195 The teeth being placed on a fixed semi-circle.

1837 Penny Cycl. IX. 129/1 The semicircle of the orchestra.

1873 W. Black Princess of Thule ii. 25 The harbor was overlooked by a semicircle of hills.

figurative.a1640 J. Fletcher et al. Queene of Corinth iv. i, in F. Beaumont & J. Fletcher Comedies & Trag. (1647) sig. Bbbbbb4/2 Has he given the lye In circle, or oblique, or semy-circle, Or direct paralell? you must challenge him.

3. A semicircular instrument or one marked with a semicircle; now only = graphometer n.

ΘΚΠ

the world > the universe > cosmology > science of observation > astronomical instruments > [noun] > other

volvelle1501

semicircle1594

octant1672

panorganon1672

Antikythera mechanism1959

the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > for measuring angles

theodolite?a1560

topographical instrument?a1560

plain table1607

circumferentor1610

diopter1613

plane table1670

circumferencera1687

graphometer1696

semicircle1701

transit theodolite1824

dioptric1849

planchette1858

theodolite-goniometer1909

gyro-theodolite1950

1594 T. Blundeville Exercises iv. f. 207 Another Circle of brasse plate..called the semi-Circle of position, which serueth chiefely for matters of Astronomie, as to finde out the twelue houses of heauen.

1701 T. Tuttell Descr. Math. Instruments in J. Moxon Math. made Easie (ed. 3) 18 Semicircle, made of Brass, with an Index and sights, Box and Needle, Ball and Socket, and Staff; containing 180 Degrees, being half the Theodolet.

1712 J. James tr. A.-J. Dézallier d'Argenville Theory & Pract. Gardening 81 Instruments made use of for tracing upon the Ground..are the Graphometre, or Semi-circle.

a1859 T. B. Macaulay Hist. Eng. (1861) V. xxiv. 133 They meet at the corner of his park with paper and pencils, a pole, a chain and a semicircle, measure his fields.

Derivatives

ˈsemicircle v. (transitive) to surround with a semicircle; intransitive to form a semicircle.

ΘΚΠ

the world > space > shape > curvature > roundness > be or become round [verb (intransitive)] > form a circle > form a semicircle

semicircle1813

the world > space > relative position > condition of being external > surrounding > surround or lie around [verb (transitive)] > surround with > with a semicircle

semicircle1813

1813 P. B. Shelley Queen Mab i. 13 An immense concave..semicircled with a belt Flashing incessant meteors.

a1864 N. Hawthorne Amer. Note-bks. (1879) II. 124 A broad streak..semicircling beneath either eye.

This entry has not yet been fully updated (first published 1911; most recently modified version published online December 2021).

单词	semicircle
释义	semicirclen. /ˈsɛmɪsəːk(ə)l/ Etymology: < Latin sēmicirculus: see semi- prefix 2b(b) and circle n. 1. The half of a circle divided by a diameter, or the half of its circumference. ΘΚΠ the world > space > shape > curvature > roundness > [noun] > circularity > semicircularity > semicircle semicircle1526 half-circle1552 hemicircle1603 hemicycle1603 demi-circle1654 semicirque1814 binant1938 1526 C. Mery Talys sig. Aiv^v [Oxford scholar speaking] Cobler I praye the sette [cut off: me two tr]yangyls and two semy cercles vpon my subpedytales. 1551 R. Record Pathway to Knowl. i. Defin. If that part be separate from the rest of the circle..And if it be parted juste by the centre..then is it called a semicircle, or halfe compasse. ?a1560 L. Digges Geom. Pract.: Pantometria (1571) i. Defs. sig. B ij A Semicircle or halfe Circle, doth conteine both the Dimetient and Centre of his circle, with the precise halfe of his circumference. 1610 P. Holland tr. W. Camden Brit. i. 208 A very antient towne..situat amidst hilles in forme of a semicircle. ?1677 S. Primatt City & Covntry Purchaser & Builder 164 The measuring of a Semi~circle, is the multiplying half the Diameter..by a quarter of the Circle. 1798 C. Hutton Course Math. I. 301 An Angle in a Semicircle, is a Right Angle. 2. A set of objects or an arrangement in the form of a half-circle; a semicircular form, formation, structure, etc. ΘΚΠ the world > space > shape > curvature > roundness > [noun] > circularity > semicircularity > semicircle > semicircular formation semicircle1598 1598 A. M. tr. J. Guillemeau Frenche Chirurg. 27/1 We must file of all such teeth which will not be contayned in the semicircle of the other teeth. a1637 B. Jonson Eng. Gram. ii. i, in Wks. (1640) III Apostrophus..should, and of the learneder sort hath his signe and marke, which is such a Semicircle ' placed in the top. 1704 Clarendon's Hist. Rebellion III. xv. 470 The smaller Ships..lay in a Semicircle, moor'd along the Shore. 1726 J. Swift Gulliver I. i. i. 24 The Chains..gave me..the Liberty of walking backwards and forwards in a Semicircle. 1817 P. B. Shelley Laon & Cythna i. v. 3 The pallid semicircle of the moon. 1831 in Jrnl. Frankl. Inst. VIII. (N.S.) 195 The teeth being placed on a fixed semi-circle. 1837 Penny Cycl. IX. 129/1 The semicircle of the orchestra. 1873 W. Black Princess of Thule ii. 25 The harbor was overlooked by a semicircle of hills. figurative.a1640 J. Fletcher et al. Queene of Corinth iv. i, in F. Beaumont & J. Fletcher Comedies & Trag. (1647) sig. Bbbbbb4/2 Has he given the lye In circle, or oblique, or semy-circle, Or direct paralell? you must challenge him. 3. A semicircular instrument or one marked with a semicircle; now only = graphometer n. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical instruments > [noun] > other volvelle1501 semicircle1594 octant1672 panorganon1672 Antikythera mechanism1959 the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > for measuring angles theodolite?a1560 topographical instrument?a1560 plain table1607 circumferentor1610 diopter1613 plane table1670 circumferencera1687 graphometer1696 semicircle1701 transit theodolite1824 dioptric1849 planchette1858 theodolite-goniometer1909 gyro-theodolite1950 1594 T. Blundeville Exercises iv. f. 207 Another Circle of brasse plate..called the semi-Circle of position, which serueth chiefely for matters of Astronomie, as to finde out the twelue houses of heauen. 1701 T. Tuttell Descr. Math. Instruments in J. Moxon Math. made Easie (ed. 3) 18 Semicircle, made of Brass, with an Index and sights, Box and Needle, Ball and Socket, and Staff; containing 180 Degrees, being half the Theodolet. 1712 J. James tr. A.-J. Dézallier d'Argenville Theory & Pract. Gardening 81 Instruments made use of for tracing upon the Ground..are the Graphometre, or Semi-circle. a1859 T. B. Macaulay Hist. Eng. (1861) V. xxiv. 133 They meet at the corner of his park with paper and pencils, a pole, a chain and a semicircle, measure his fields. Derivatives ˈsemicircle v. (transitive) to surround with a semicircle; intransitive to form a semicircle. ΘΚΠ the world > space > shape > curvature > roundness > be or become round [verb (intransitive)] > form a circle > form a semicircle semicircle1813 the world > space > relative position > condition of being external > surrounding > surround or lie around [verb (transitive)] > surround with > with a semicircle semicircle1813 1813 P. B. Shelley Queen Mab i. 13 An immense concave..semicircled with a belt Flashing incessant meteors. a1864 N. Hawthorne Amer. Note-bks. (1879) II. 124 A broad streak..semicircling beneath either eye. This entry has not yet been fully updated (first published 1911; most recently modified version published online December 2021). < n.1526
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