From The Collaborative International Dictionary of English v.0.44 [gcide]:
Cycloid \Cy"cloid\, noun (Zo["o]l.) One of the Cycloidei.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Cycloid \Cy"cloid\ (s?"kloid), noun [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 (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.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Cycloid \Cy"cloid\, adjective (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.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Brachystochrone \Bra*chys"to*chrone\, noun [Incorrect for brachistochrone, fr. Gr. bra'chistos shortest (superl. of brachy's short) + ? time : cf. F. brachistochrone. ] (Math.) A curve, in which a body, starting from a given point, and descending solely by the force of gravity, will reach another given point in a shorter time than it could by any other path. This curve of quickest descent, as it is sometimes called, is, in a vacuum, the same as the {cycloid}.
From WordNet (r) 2.0 [wn]:
adjective
1: resembling a circle [syn: {cycloidal}]
noun
1: a line generated by a point on a circle rolling along a straight line
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