n. - 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.
a. - Admitting of rotation on an axis; -- sometimes applied to
a pivot joint like that between the atlas and axis in the vertebral
column.
a. - Top-shaped; having a flat base and conical spire; -- said
of certain shells.
a. - Of or pertaining to the genus Trochus or family
Trochidae.