Conchoid(n.)
- 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.
Conchoidal(a.)
- Having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.
Conchoidally
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Conchoids
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