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Webster's Dictionary (1865)

Trō'choid, n.

noun

(trō'koid), n. [Fr. trochoïde, from Gr. τροχός, a wheel, and εἶδος, form. See TROCHE.]

  1. (Geom.) The curve described by any point in a wheel rolling on a straight line; a cycloid.
  2. (Anat.) An articulation in which one bone turns upon another like a wheel upon its axle.