|1.||maths See minor a number associated with an element in a square matrix, equal to the determinant of the matrix formed by removing the row and column in which the element appears from the given determinant|
|2.||biochem a nonprotein substance that forms a complex with certain enzymes and is essential for their activity. It may be a metal ion or a coenzyme|
cofactor co·fac·tor (kō'fāk'tər)
A substance, such as a metallic iron or coenzyme, that must be associated with an enzyme for the substance to function.