Pronunciation: (kō'fak"tur), [key]
1. Biochem.any of various organic or inorganic substances necessary to the function of an enzyme.
a. a prefactor or postfactor.
b. the product of the minor of a given element of a matrix times -1 raised to the power of the sum of the indices of the row and column crossed out in forming the minor.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.