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Meaning of CONCHOID

 
Webster's 1913 Dictionary
 
 Definition: 
\Con"choid\, n. [Gr. ?; ? shell + ? 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.

 

 

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