From The Collaborative International Dictionary of English v.0.44 [gcide]:
Trinomial \Tri*no"mi*al\, noun [Pref. tri- + -nomial as in binomial: cf. F. trin[^o]me.] (Math.) A quantity consisting of three terms, connected by the sign + or -; as, x + y + z, or ax + 2b - c^{2}.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Trinomial \Tri*no"mi*al\, adjective
1. (Math.) 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. [Webster 1913 Suppl.]
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