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Entry 4 senses · 2 variants Webster, 1913

Trochoid

· Tro·choid · IPA
01 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 …
  1. 1.
    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.(Geom.)
02 a. Admitting of rotation on an axis; -- sometimes applied to a pivot joint like that between the atlas and axis in the vertebral column.
  1. 1.
    Admitting of rotation on an axis; -- sometimes applied to a pivot joint like that between the atlas and axis in the vertebral column.(Anat.)
  2. 2.
    Top-shaped; having a flat base and conical spire; -- said of certain shells.(Zool.)
  3. 3.
    Of or pertaining to the genus Trochus or family Trochidae.(Zool.)