In geometry, a curve generated by the motion of a wheel; the cycloid.
Word of the Day: Catachrestical
1. Admitting of rotation on an axis; -- sometimes applied to a pivot joint like that between the atlas and axis in the vertebral column.
2. Top-shaped; having a flat base and conical spire; -- said of certain shells.
3. Of or pertaining to the genus Trochus or family Trochidae.
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.
2. See Trochoid, a.
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