'Conchoid' definitions:
Definition of 'Conchoid'
From: GCIDE
- Conchoid \Con"choid\, n. [Gr. ?; ? shell + e'i^dos form: cf. F. concho["i]de.] (Geom.) A curve, of the fourth degree, first made use of by the Greek geometer, Nicomedes, who invented it for the purpose of trisecting an angle and duplicating the cube. [1913 Webster]