2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Trochoid \Tro"choid\, n. [Gr. ? a wheel + -oid; cf. F. trocho["i]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. [1913 Webster] From The Collaborative International Dictionary of English v.0.48 [gcide]: Trochoid \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. [1913 Webster] 2. (Zool.) Top-shaped; having a flat base and conical spire; -- said of certain shells. [1913 Webster] 3. (Zool.) Of or pertaining to the genus Trochus or family {Trochidae}. [1913 Webster]
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