The Collaborative International Dictionary of English v.0.48:

Monomial \Mo*no"mi*al\, n. [See Monome, Binomial.] (Alg.)
   A single algebraic expression; that is, an expression
   unconnected with any other by the sign of addition,
   substraction, equality, or inequality.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Monomial \Mo*no"mi*al\, a. (Alg.)
   Consisting of but a single term or expression.
   [1913 Webster] Monomorphic