Adjacent Words

Cycloid definitions

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Webster's 1828 Dictionary

CYCLOID, n. 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.

WordNet (r) 3.0 (2005)

adj
1: resembling a circle [syn: cycloid, cycloidal] n
1: a line generated by a point on a circle rolling along a straight line

Merriam Webster's

I. noun Etymology: French cycloïde, from Greek kykloeid?s circular, from kyklos Date: 1661 a curve that is generated by a point on the circumference of a circle as it rolls along a straight line • cycloidal adjective II. adjective Date: 1847 1. smooth with concentric lines of growth <cycloid scales>; also having or consisting of cycloid scales 2. characterized by alternating high and low moods <a cycloid personality>

Oxford Reference Dictionary

n. Math. a curve traced by a point on a circle when the circle is rolled along a straight line. Derivatives: cycloidal adj. Etymology: Gk kukloeides (as CYCLE, -OID)

Webster's 1913 Dictionary

Cycloid Cy"cloid (s?"kloid), n. [Cyclo- + -oid: cf. F. cyclo["i]de.] (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. Note: The common cycloid is the curve described when the generating point 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 lies within that circumference.

Webster's 1913 Dictionary

Cycloid Cy"cloid, a. (Zo["o]l.) Of or pertaining to the Cycloidei. Cycloid scale (Zo["o]l.), a fish scale which is thin and shows concentric lines of growth, without serrations on the margin.

Webster's 1913 Dictionary

Cycloid Cy"cloid, n. (Zo["o]l.) One of the Cycloidei.