trinomial: Meaning and Definition of

tri•no•mi•al

1. consisting of or pertaining to three terms.
1. pertaining to a scientific name comprising three terms, as of genus, species, and subspecies or variety.
2. characterized by the use of such names.

1. an expression that is a sum or difference of three terms, as 3x + 2y + z or 3x + 2x + x.
2. a trinomial name, as Rosa gallica pumila.