n. [ Pref. hypo- + trochoid. ] (Geom.) A curve, traced by a point in the radius, or radius produced, of a circle which rolls upon the concave side of a fixed circle. See Hypocycloid, Epicycloid, and Trochoid. [ 1913 Webster ]
n. [ Gr. &unr_; a wheel + -oid; cf. F. trochoïde. 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 ]
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 ]
(n) a freely moving joint in which movement is limited to rotation, Syn.rotary joint, articulatio trochoidea, rotatory joint, Example: the articulation of the radius and ulna in the arm is a pivot joint
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