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trinomial a. 三项式的 三项式的 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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