TROCHOID

Etymology

Noun

trochoid (plural trochoids)

(mathematics) The curve traced by a point on a circle as it rolls along a straight line

Adjective

trochoid (comparative more trochoid, superlative most trochoid)

capable of rolling

allowing rotation

Source: Wiktionary

Tro"choid, n. Etym: [Gr. -oid; cf. F. trochoïde. See Troche.] (Geom.)

Definition: The curve described by any point in a wheel rolling on a line; a cycloid; a roulette; in general, the curve described by any point fixedly connected with a moving curve while the moving curve rolls without slipping on a second fixed curve, the curves all being in one plane. Cycloids, epicycloids, hypocycloids, cardioids, etc., are all trochoids.

Tro"choid, a.

1. (Anat.)

Definition: Admitting of rotation on an axis; -- sometimes applied to a pivot joint like that between the atlas and axis in the vertebral column.

2. (Zoöl.)

Definition: Top-shaped; having a flat base and conical spire; -- said of certain shells.

3. (Zoöl.)

Definition: Of or pertaining to the genus Trochus or family Trochidæ.

Source: Webster’s Unabridged Dictionary 1913 Edition