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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]


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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