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Entry 3 senses · 3 variants Webster, 1913

Cycloid

/(s?"kloid)/ · Cy·cloid · IPA /ˈsaɪklɔɪd/
01 n. A curve generated by a point in the plane of a circle when the circle is rolled along a straight line, keeping always in the same plane.
  1. 1.
    A curve generated by a point in the plane of a circle when the circle is rolled along a straight line, keeping always in the same plane.(Geom.)
02 a. Of or pertaining to the Cycloidei.
  1. 1.
    Of or pertaining to the Cycloidei.(Zool.)
Phrases & compounds
Cycloid scale — a fish scale which is thin and shows concentric lines of growth, without serrations on the margin.
03 n. One of the Cycloidei.
  1. 1.
    One of the Cycloidei.(Zool.)