conchoidn.adj.

Brit.

/ˈkɒŋkɔɪd/, U.S.

/ˈkɑŋˌkɔɪd/

Etymology: < Greek κογχοειδής mussel-like, < κόγχη mussel-shell + -ειδης -form: see -oid suffix: in modern French conchoïde.

A. n.

a. Geometry. A plane curve of the fourth order invented by Nicomedes.If from a fixed point (the pole) straight lines be drawn intersecting a fixed straight line (the asymptote), and on these lines points be taken at a constant distance from their intersections with the asymptote, this succession of points will form a conchoid of Nicomedes consisting of two branches, one on each side of the asymptote.

ΘΚΠ

the world > relative properties > number > geometry > curve > [noun] > of specific order

cissoid1656

conchoid1798

quartic1854

nonic1856

Cayleyan1873

1798 Anti-Jacobin 16 Apr. 181/1 Ye Conchoids extend.

1807 C. Hutton Course Math. (ed. 5) II. 320 To find the point of inflexion in the Conchoid of Nicomedes.

1821 S. T. Coleridge in Blackwood's Edinb. Mag. 10 255 I never take a turn round the garden without thinking of his billow-lines and shell-lines, under the well-sounding names of Cumaïds and Conchoïds.

1879 G. Salmon Treat. Higher Plane Curves ii. 44 A curve, called the conchoid of Nicomedes, invented by that geometer for the solution of the problem of finding two mean proportionals.

b. spherical conchoid: Herschel's name for a similar curve, traced on the surface of a sphere.

ΚΠ

1797 Encycl. Brit. II. 483/1.

B. adj.

= conchoidal adj.

ΘΚΠ

the world > the earth > minerals > mineral structure or appearance > [adjective] > cleavage or fracture

beddy1709

splintery1794

conchoid1802

conchoidal1802

graphic1814

axotomous1834

fendillated1853

plagioclastic1869

plagioclasic1913

1802 Howard in Philos. Trans. (Royal Soc.) 92 207 Its fracture is usually conchoid.

This entry has not yet been fully updated (first published 1891; most recently modified version published online March 2022).

单词	conchoid
释义	conchoidn.adj. Brit. /ˈkɒŋkɔɪd/, U.S. /ˈkɑŋˌkɔɪd/ Etymology: < Greek κογχοειδής mussel-like, < κόγχη mussel-shell + -ειδης -form: see -oid suffix: in modern French conchoïde. A. n. a. Geometry. A plane curve of the fourth order invented by Nicomedes.If from a fixed point (the pole) straight lines be drawn intersecting a fixed straight line (the asymptote), and on these lines points be taken at a constant distance from their intersections with the asymptote, this succession of points will form a conchoid of Nicomedes consisting of two branches, one on each side of the asymptote. ΘΚΠ the world > relative properties > number > geometry > curve > [noun] > of specific order cissoid1656 conchoid1798 quartic1854 nonic1856 Cayleyan1873 1798 Anti-Jacobin 16 Apr. 181/1 Ye Conchoids extend. 1807 C. Hutton Course Math. (ed. 5) II. 320 To find the point of inflexion in the Conchoid of Nicomedes. 1821 S. T. Coleridge in Blackwood's Edinb. Mag. 10 255 I never take a turn round the garden without thinking of his billow-lines and shell-lines, under the well-sounding names of Cumaïds and Conchoïds. 1879 G. Salmon Treat. Higher Plane Curves ii. 44 A curve, called the conchoid of Nicomedes, invented by that geometer for the solution of the problem of finding two mean proportionals. b. spherical conchoid: Herschel's name for a similar curve, traced on the surface of a sphere. ΚΠ 1797 Encycl. Brit. II. 483/1. B. adj. = conchoidal adj. ΘΚΠ the world > the earth > minerals > mineral structure or appearance > [adjective] > cleavage or fracture beddy1709 splintery1794 conchoid1802 conchoidal1802 graphic1814 axotomous1834 fendillated1853 plagioclastic1869 plagioclasic1913 1802 Howard in Philos. Trans. (Royal Soc.) 92 207 Its fracture is usually conchoid. This entry has not yet been fully updated (first published 1891; most recently modified version published online March 2022). < n.adj.1797
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