Conchoid

1 definition found

From The Collaborative International Dictionary of English v.0.48 [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]