Pronunciation: (trī-nō'mē-ul), [key]
1. Algebra.consisting of or pertaining to three terms.
a. pertaining to a scientific name comprising three terms, as of genus, species, and subspecies or variety.
b. characterized by the use of such names.
1. Algebra.an expression that is a sum or difference of three terms, as 3x + 2y + z or 3x3 + 2x2 + x.
2. Biol.a trinomial name, as Rosa gallica pumila.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.