PORISM

porism. Porism, n. a general theorem, a general rule

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Po″rism (?), n. [[Gr. � a thing procured, a deduction from a demonstration, fr. � to bring, provide: cf. F. porisme.]] 1. 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.
2. 2. (Gr. Geom.) A corollary. Brande & C.
☞ 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.