(?), n. [Gr. a thing procured, a deduction from a demonstration, fr. 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.
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2. (Gr. Geom.) A corollary. Brande & C.
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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.
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(?), } a. Of or pertaining to a porism; poristic.
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(?), } a. [Gr. for providing, provided.] Of or pertaining to a porism; of the nature of a porism.
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