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Meaning of Cycoid


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  • (geometry) The locus of a point on a circle that rolls along a straight line.
  • (zoology) A fish having cycloid scales.
  • Resembling a circle; cycloidal.
  • (zoology) (of fish scales) Thin and rounded, with smooth edges.
- The Nuttall Encyclopedia



Cy"cloid (s?"kloid), n. [Cyclo- + -oid: cf. F. cycloïde.] (Geom.) 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.

&fist; The common cycloid is the curve described when the generating point (p) is on the circumference of the generating circle; the curtate cycloid, when that point lies without the circumference; the prolate or inflected cycloid, when the generating point (p) lies within that circumference.

Cy"cloid, a. (Zoöl.) Of or pertaining to the Cycloidei.

Cycloid scale(Zoöl.), a fish scale which is thin and shows concentric lines of growth, without serrations on the margin.

Cy"cloid, n. (Zoöl.) One of the Cycloidei.

- Webster's Unabridged Dictionary (1913)



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The correct spelling of this word ought to be: Cycloid

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