(n) a concave reflector used to produce a parallel beam when the source is placed at its focus or to focus an incoming parallel beam, Syn.paraboloid reflector
The Collaborative International Dictionary of English (GCIDE) v.0.53
n. [ Parabola + -oid: cf. F. paraboloïde. ] (Geom.) The solid generated by the rotation of a parabola about its axis; any surface of the second order whose sections by planes parallel to a given line are parabolas. [ 1913 Webster ]
☞ The term paraboloid has sometimes been applied also to the parabolas of the higher orders. Hutton. [ 1913 Webster ]
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