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Webster 1913 Edition

Cycloid

Cy′cloid

(s?′kloid)
,
Noun.
[
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.
☞ 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

,
Adj.
(Zool.)
Of or pertaining to the Cycloidei.
Cycloid scale
(Zool.)
,
a fish scale which is thin and shows concentric lines of growth, without serrations on the margin.

Cy′cloid

,
Noun.
(Zool.)
One of the Cycloidei.

Webster 1828 Edition

Cycloid

CYCLOID

,
Noun.
A geometrical curve on which depends the doctrine of pendulums; a figure made by the upper end of the diameter of a circle, turning about a right line. The genesis of a cycloid may be conceived by imagining a nail in the circumference of a wheel; the line which the nail describes in the air, while the wheel revolves in a right line, is the cycloid.

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