cycloid
/ˈsaɪklɔɪd/ noun, adjective
Forms cycloids
- noun (geometry) The locus of a point on the circumference of a circle that rolls without slipping on a fixed straight line.
- noun (zoology) A fish having cycloid scales.
- adjective Resembling a circle; cycloidal.
- adjective (zoology, of fish scales) Thin and rounded, with smooth edges.
- adjective (psychoanalysis) characterized by alternating high and low moods.
Synonyms
Etymology
From cyclo- + -oid.
Webster’s 1913
- noun 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.
- adjective 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.
- noun One of the Cycloidei.
Etymology [Cyclo- + -oid: cf. F. cycloïde.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “cycloid”, CC BY-SA 4.0. Details