trochoid

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English[edit]

Etymology[edit]

From Ancient Greek τροχοειδής (trokhoeidḗs), from τροχός (trokhós, wheel) + εἶδος (eîdos, form, image).

Noun[edit]

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trochoid (plural trochoids)

  1. (geometry) The curve traced by a point on a circle as it rolls along a straight line
  2. (malacology) An organism or fossil with a trochoid shell (especially one in the gastropod family Trochidae), or the shell itself.

Adjective[edit]

trochoid (comparative more trochoid, superlative most trochoid)

  1. Capable of rolling.
  2. Allowing rotation.
  3. (malacology, of a shell or fossil) High-spired; conical.
    Bartsch's star bolma has a trochoid shell.