单词：trochoid
a. 车轴状的
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.
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