Conchoid

Con"choid

(?), n. [Gr. ; shell + e'i^dos form: cf. F. conchode.] (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]

 

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Sun 16th December 2018