(geometry) The locus of a point on the circumference of a circle that rolls without slipping on a fixed straight line. / (zoology) A fish having cycloid scales.

Resembling a circle; cycloidal. / (zoology, of fish scales) Thin and rounded, with smooth edges. / (psychoanalysis) characterized by alternating high and low moods.

pertaining to or resembling a cycloid, or a circle.

plural of cycloid

In a cycloidal manner.

(architecture) An arch that has a cycloidal shape, wherein the span of the arch is some factor of pi*rise.

plural of cycloidal arch

plural of cycloidian

(zoology) cycloid

(zoology) cycloid