Trinomial
Trinomial , noun
[Prefix tri- + -nomial as in binomial: compare French trinôme.]
(Mathematics) A quantity consisting of three terms, connected by the sign + or -; as, x + y + z, or ax + 2b - c2.
Trinomial , adjective
1.
(Mathematics) Consisting of three terms; of or pertaining to trinomials; as, a trinomial root.
2.
(Nat. Hist.) Consisting of, or involving the use of, three terms; as, a trinomial systematic name specifying the genus, species, and variety.