cy·cloid (s  kloid )adj. 1. Resembling a circle. 2. Zoology a. Thin, rounded, and smooth-edged; disklike. Used of fish scales. b. Having or composed of such scales. 3. Psychiatry Afflicted with or relating to cyclothymia. n. 1. Mathematics The curve traced by a point on the circumference of a circle that rolls on a straight line. 2. Zoology A fish having cycloid scales. [French cycloïde, from Greek kukloeid  s, circular : kuklos, circle; see kwel-1 in Indo-European roots + -oeids, -oid.]cy·cloi dal (-kloidl) adj. |   top: surface view of cycloid scales of a bony fish bottom: The parametric equation of this cycloid is: x=r(  - sin)y=r(1 - cos ) |
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