n. [ Gr. &unr_; a thing procured, a deduction from a demonstration, fr. &unr_; to bring, provide: cf. F. porisme. ] 1. (Geom.) A proposition affirming the possibility of finding such conditions as will render a certain determinate problem indeterminate or capable of innumerable solutions. Playfair. [ 1913 Webster ]
2. (Gr. Geom.) A corollary. Brande & C. [ 1913 Webster ]
☞ Three books of porisms of Euclid have been lost, but several attempts to determine the nature of these propositions and to restore them have been made by modern geometers. [ 1913 Webster ]
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