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.