helicoidadj.n.

/ˈhɛlɪkɔɪd/

Forms: Also 1600s -oeid.

Etymology: modern < Greek ἑλικοειδής of winding or spiral form, < ἕλιξ helix n. + εἶδος shape: see -oid suffix. Compare French hélicoïde (1704 in Hatzfeld & Darmesteter).

A. adj.

1. Having the form of a helix; screw-shaped; spiral. Chiefly in Zoology of shells, and in Botany of forms of inflorescence, etc. helicoid parabola n. = parabolic spiral n. at parabolic adj. and n. Compounds.

ΘΚΠ

the world > relative properties > number > geometry > curve > [noun] > spiral

spiral1656

helicoid parabola1704

logistic spiral-

the world > space > shape > curvature > coil > [adjective] > spiral or helical > helical

spiral1556

whelkeda1560

screwish1570

helical1613

screwed1615

cochleary1646

cochleous1694

helicoid1704

cochleateda1728

cochleate1835

helicoidal1864

1704 J. Harris Lexicon Technicum I Helicoid Parabola, or the Parabolick Spiral, is a Curve which arises from the Supposition of the Axis of the common Apollonian Parabola's being bent round into the Periphery of a Circle.

1796 C. Hutton Math. & Philos. Dict. Helicoid Parabola, or the Parabolic Spiral.

1835 J. Lindley Introd. Bot. (1848) I. 324 The cyme..is helicoid or scorpioid.

1849 J. D. Dana U.S. Exploring Exped.: Geol. (1850) App. i. 721 The fusiform helicoid cavity.

1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 521 The Unilateral Helicoid Cyme is a sympodial cyme in which the median plane of each of the successive axes..is always situated on the same side.

2. Zoology. Belonging to or resembling the Helicidæ, gastropodous molluscs including the snail.

ΚΠ

1876 P. J. Van Beneden Animal Parasites & Messmates 37 Molluscs..with a helicoid shell, similar to that of a small natica.

B. n.

1. Something of a helicoid or spiral form.

ΘΚΠ

the world > space > shape > curvature > coil > [noun] > a spiral > spiral or helical object

screw1615

helicoid1699

volute1756

spiral1853

1699 S. Garth Dispensary vi. 72 Shells Some Helicoeids, some Conical appear, These, Miters emulate, Those, Turbans are.

1959 New Scientist 5 Mar. 515/2 Inside the silencer cylinders there are two helicoids which have the effect of mincing the air flow passing through the cylinder.

2. Geometry.

Categories »

†a. = Helicoid parabola: see A. 1. Obsolete.

b. A warped surface generated by a moving straight line which always passes through or touches a fixed helix.

ΚΠ

1842 W. T. Brande Dict. Sci., Lit. & Art 547/1 [This] spiral curve..is the helicoid.

1855 C. Davies & W. G. Peck Math. Dict. Helicoid, a warped surface, which may be generated by a straight line moving in such a manner that each point of it shall have a uniform motion in the direction of a fixed straight line, and at the same time a uniform angular motion about it.

This entry has not yet been fully updated (first published 1898; most recently modified version published online December 2020).

单词	helicoid
释义	helicoidadj.n. /ˈhɛlɪkɔɪd/ Forms: Also 1600s -oeid. Etymology: modern < Greek ἑλικοειδής of winding or spiral form, < ἕλιξ helix n. + εἶδος shape: see -oid suffix. Compare French hélicoïde (1704 in Hatzfeld & Darmesteter). A. adj. 1. Having the form of a helix; screw-shaped; spiral. Chiefly in Zoology of shells, and in Botany of forms of inflorescence, etc. helicoid parabola n. = parabolic spiral n. at parabolic adj. and n. Compounds. ΘΚΠ the world > relative properties > number > geometry > curve > [noun] > spiral spiral1656 helicoid parabola1704 logistic spiral- the world > space > shape > curvature > coil > [adjective] > spiral or helical > helical spiral1556 whelkeda1560 screwish1570 helical1613 screwed1615 cochleary1646 cochleous1694 helicoid1704 cochleateda1728 cochleate1835 helicoidal1864 1704 J. Harris Lexicon Technicum I Helicoid Parabola, or the Parabolick Spiral, is a Curve which arises from the Supposition of the Axis of the common Apollonian Parabola's being bent round into the Periphery of a Circle. 1796 C. Hutton Math. & Philos. Dict. Helicoid Parabola, or the Parabolic Spiral. 1835 J. Lindley Introd. Bot. (1848) I. 324 The cyme..is helicoid or scorpioid. 1849 J. D. Dana U.S. Exploring Exped.: Geol. (1850) App. i. 721 The fusiform helicoid cavity. 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 521 The Unilateral Helicoid Cyme is a sympodial cyme in which the median plane of each of the successive axes..is always situated on the same side. 2. Zoology. Belonging to or resembling the Helicidæ, gastropodous molluscs including the snail. ΚΠ 1876 P. J. Van Beneden Animal Parasites & Messmates 37 Molluscs..with a helicoid shell, similar to that of a small natica. B. n. 1. Something of a helicoid or spiral form. ΘΚΠ the world > space > shape > curvature > coil > [noun] > a spiral > spiral or helical object screw1615 helicoid1699 volute1756 spiral1853 1699 S. Garth Dispensary vi. 72 Shells Some Helicoeids, some Conical appear, These, Miters emulate, Those, Turbans are. 1959 New Scientist 5 Mar. 515/2 Inside the silencer cylinders there are two helicoids which have the effect of mincing the air flow passing through the cylinder. 2. Geometry. Categories » †a. = Helicoid parabola: see A. 1. Obsolete. b. A warped surface generated by a moving straight line which always passes through or touches a fixed helix. ΚΠ 1842 W. T. Brande Dict. Sci., Lit. & Art 547/1 [This] spiral curve..is the helicoid. 1855 C. Davies & W. G. Peck Math. Dict. Helicoid, a warped surface, which may be generated by a straight line moving in such a manner that each point of it shall have a uniform motion in the direction of a fixed straight line, and at the same time a uniform angular motion about it. This entry has not yet been fully updated (first published 1898; most recently modified version published online December 2020). < adj.n.1699
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