Po"rism (?), 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.
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.