Category:Trochoid

Tro"choid, n. Etym: [gr. -oid; cf. F. trochoïde. See troche.] (geom.)

Defn: 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.

Trochoid Tro"choid, a.

1. (anat.)

Defn: 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.)

Defn: top-shaped; having a flat base and conical spire; -- said of Certain shells.

3. (zoöl.)

Defn: of or pertaining to the genus trochus or family trochidæ.