cycloid

Definitions

1. 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. 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.
2. 2.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.
3. 3.One of the Cycloidei.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

Related questions

• What does "cycloid" mean?

Reverse-dictionary questions

Definition-first questions whose answer is cycloid.

• What is 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 called?