Anything that has a form resembling that of a cone.
2.
(Geom.)
(a)
A solid formed by the revolution of a conic section about its axis; as, a parabolic conoid, elliptic conoid, etc.; more commonly called paraboloid, ellipsoid, etc.
(b)
A surface which may be generated by a straight line moving in such a manner as always to meet a given straight line and a given curve, and continue parallel to a given plane.
... in mosaic glass, and other glass beads (hard stone and bronze more rarely): conoid seals in hard crystalline stones, usually engraved with figure praying to the Moon-god: also soft stone, glass and paste conoids. Scarabs and scaraboids in paste. ... — How to Observe in Archaeology • Various
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