SG Heritage Dictionary

Cycloid [Noun] Webster's Dictionary 1828

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

Cycloid [Adjective] Webster's Dictionary 1913

Of or pertaining to the Cycloidei.

Cycloid [Noun] Webster's Dictionary 1913

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.

2. One of the Cycloidei.

Cycloidal [Adjective] Webster's Dictionary 1828

Pertaining or relating to a cycloid; as, the cycloidal space is the space contained between the cycloid and its substance. Or the space contained between the curve or crooked line and the subtense of the figure.

Cycloidal [Adjective] Webster's Dictionary 1913

Pertaining to, or resembling, a cycloid; as, the cycloidal space is the space contained between a cycloid and its base.

Cycloidei [Noun plural] Webster's Dictionary 1913

An order of fishes, formerly proposed by Agassiz, for those with thin, smooth scales, destitute of marginal spines, as the herring and salmon. The group is now regarded as artificial.

Cycloidian [Adjective and noun] Webster's Dictionary 1913

Same as 2d and 3d Cycloid.