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TROCHOID - Definiția din dicționar

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Tro"choid (?), n. [Gr. &unr_; a wheel + -oid; cf. F. trocho&ï;de. See Troche.] (Geom.) 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.
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Tro"choid, a. 1. (Anat.) Admitting of rotation on an axis; -- sometimes applied to a pivot joint like that between the atlas and axis in the vertebral column.
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2. (Zo&ö;l.) Top-shaped; having a flat base and conical spire; -- said of certain shells.
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3. (Zo&ö;l.) Of or pertaining to the genus Trochus or family Trochidæ.
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