trochoidn.adj.

Brit.

/ˈtrəʊkɔɪd/,

/ˈtrɒkɔɪd/, U.S.

/ˈtroʊˌkɔɪd/

Etymology: < Greek τροχοειδής round like a wheel, < τροχός wheel + εἶδος form: see -oid suffix; compare French trochoïde (1658 in Hatzfeld & Darmesteter).

A. n.

1. Geometry. A curve traced by a point on or connected with a rolling circle; originally = cycloid n. 1: now usually restricted to the curtate and prolate cycloids, traced respectively by points within and without the circle; also extended to curves similarly generated by a circle rolling upon another circle, either inside it (hypotrochoid n.) or outside it (epitrochoid n.).

ΘΚΠ

the world > relative properties > number > geometry > curve > [noun] > generated by or related to a point > by revolution

cycloid1661

epicycloid1696

trochoid1704

involute figure or curve1706

roulette1708

evolute1753

epicycle1756

involute1796

hypocycloid1843

hypotrochoid1843

axoid1876

epicyclic1878

astroid1886

1704 J. Harris Lexicon Technicum I. (at cited word) A Curve Line..called a Cycloid or Trochoid.

1711 W. Sutherland Ship-builders Assistant 59 The Cycloids or Trochoids.

1867 E. B. Denison Astron. without Math. (ed. 3) 86 (note) That curve is called a trochoid, but when the tracing point is on the circumference it becomes a cycloid.

1881 C. W. Bourne in Eng. Mech. No. 874. 377/1 The bar AB is jointed to a bar BC, so that while AB revolves round A as centre, BC can also revolve round B as centre, then a curve will be described by the point C... Every such curve is comprised under the name ‘trochoid’.

2. Zoology. A gastropod of the family Trochidæ; a top-shell.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [noun] > superorder Branchifera > order Prosobranchiata > section Holostomata > family Trochidae > member of genus Trochus

topa1682

whirl1708

shuttle1750

trochus1753

trochoid1839

silver buckie?1841

trochid1861

1839 Penny Cycl. XIV. 317/2 Mollusca... Class III. Gastropoda... Order 6. Pectinibranchiata. Family of Trochöids.

3. Anatomy. A trochoid articulation, a pivot-joint.

ΚΠ

1842 [see sense B. 3].

B. adj.

1. Geometry. = trochoidal adj. 1. rare.Apparently only attested in dictionaries or glossaries.

ΚΠ

1882 Ogilvie's Imperial Dict. (new ed.) Trochoid, a. i. Trochoidal.

2. Conchology. Top-shaped, conical with flat base, as the shells of the genus Trochus or family Trochidæ; Zoology, belonging to the family Trochidæ.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [adjective] > of superorder Branchifera > belonging to order Prosobranchiata > of section Holostomata > of family Trochidae

trochoid1859

1859 J. R. Greene Man. Animal Kingdom I. 16 If..the spiral passes obliquely round an axis, the shell assumes a more or less pyramidal form, and is termed ‘trochoid’.

1861 P. P. Carpenter in Rep. Smithsonian Inst. 1860 213 The..African group Collonia have small Trochoid shells.

3. Anatomy. Applied to a pivot-joint, in which one bone turns upon another with a rotary motion.

ΚΠ

1842 R. Dunglison Med. Lexicon (ed. 3) Trochoid, an articulation, in which one bone turns upon another, like a wheel upon its axle.

1860 R. G. Mayne Expos. Lexicon Med. Sci. Trochoides,..resembling a wheel: trochoid. Anat. Applied to a movable connexion of bones in which one bone rotates upon another, as the first cervical vertebra upon the odontoid process of the second.

This entry has not yet been fully updated (first published 1915; most recently modified version published online June 2022).

单词	trochoid
释义	trochoidn.adj. Brit. /ˈtrəʊkɔɪd/, /ˈtrɒkɔɪd/, U.S. /ˈtroʊˌkɔɪd/ Etymology: < Greek τροχοειδής round like a wheel, < τροχός wheel + εἶδος form: see -oid suffix; compare French trochoïde (1658 in Hatzfeld & Darmesteter). A. n. 1. Geometry. A curve traced by a point on or connected with a rolling circle; originally = cycloid n. 1: now usually restricted to the curtate and prolate cycloids, traced respectively by points within and without the circle; also extended to curves similarly generated by a circle rolling upon another circle, either inside it (hypotrochoid n.) or outside it (epitrochoid n.). ΘΚΠ the world > relative properties > number > geometry > curve > [noun] > generated by or related to a point > by revolution cycloid1661 epicycloid1696 trochoid1704 involute figure or curve1706 roulette1708 evolute1753 epicycle1756 involute1796 hypocycloid1843 hypotrochoid1843 axoid1876 epicyclic1878 astroid1886 1704 J. Harris Lexicon Technicum I. (at cited word) A Curve Line..called a Cycloid or Trochoid. 1711 W. Sutherland Ship-builders Assistant 59 The Cycloids or Trochoids. 1867 E. B. Denison Astron. without Math. (ed. 3) 86 (note) That curve is called a trochoid, but when the tracing point is on the circumference it becomes a cycloid. 1881 C. W. Bourne in Eng. Mech. No. 874. 377/1 The bar AB is jointed to a bar BC, so that while AB revolves round A as centre, BC can also revolve round B as centre, then a curve will be described by the point C... Every such curve is comprised under the name ‘trochoid’. 2. Zoology. A gastropod of the family Trochidæ; a top-shell. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [noun] > superorder Branchifera > order Prosobranchiata > section Holostomata > family Trochidae > member of genus Trochus topa1682 whirl1708 shuttle1750 trochus1753 trochoid1839 silver buckie?1841 trochid1861 1839 Penny Cycl. XIV. 317/2 Mollusca... Class III. Gastropoda... Order 6. Pectinibranchiata. Family of Trochöids. 3. Anatomy. A trochoid articulation, a pivot-joint. ΚΠ 1842 [see sense B. 3]. B. adj. 1. Geometry. = trochoidal adj. 1. rare.Apparently only attested in dictionaries or glossaries. ΚΠ 1882 Ogilvie's Imperial Dict. (new ed.) Trochoid, a. i. Trochoidal. 2. Conchology. Top-shaped, conical with flat base, as the shells of the genus Trochus or family Trochidæ; Zoology, belonging to the family Trochidæ. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [adjective] > of superorder Branchifera > belonging to order Prosobranchiata > of section Holostomata > of family Trochidae trochoid1859 1859 J. R. Greene Man. Animal Kingdom I. 16 If..the spiral passes obliquely round an axis, the shell assumes a more or less pyramidal form, and is termed ‘trochoid’. 1861 P. P. Carpenter in Rep. Smithsonian Inst. 1860 213 The..African group Collonia have small Trochoid shells. 3. Anatomy. Applied to a pivot-joint, in which one bone turns upon another with a rotary motion. ΚΠ 1842 R. Dunglison Med. Lexicon (ed. 3) Trochoid, an articulation, in which one bone turns upon another, like a wheel upon its axle. 1860 R. G. Mayne Expos. Lexicon Med. Sci. Trochoides,..resembling a wheel: trochoid. Anat. Applied to a movable connexion of bones in which one bone rotates upon another, as the first cervical vertebra upon the odontoid process of the second. This entry has not yet been fully updated (first published 1915; most recently modified version published online June 2022). < n.adj.1704
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