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The Collaborative International Dictionary of English v.0.48 (gcide)

Trinomial \Tri*no"mi*al\, n. [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}.
[1913 Webster]


Trinomial \Tri*no"mi*al\, a.
1. (Math.) Consisting of three terms; of or pertaining to
trinomials; as, a trinomial root.
[1913 Webster]

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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