conchoid
Con"choid, n. Etym: [Gr. conchoïde.] (Geom.) Defn: 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.
Con"choid, n. Etym: [Gr. conchoïde.] (Geom.) Defn: 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.