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Meaning of cycloid

cy•cloid

Pronunciation: (sī'kloid), [key]
— adj.
  1. resembling a circle; circular.
  2. (of the scale of a fish) smooth-edged, more or less circular in form, and having concentric striations.
  3. (of a fish) having such scales.
  4. of or noting a personality type characterized by wide fluctuation in mood within the normal range.
—n.
  1. a cycloid fish.
  2. a curve generated by a point on the circumference of a circle that rolls, without slipping, on a straight line.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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