Tri‐no″mi‐al (?), n. [Pref. tri- + -nomial as in binomial: cf. F. trinôme.] (Math.) A quantity consisting of three terms, connected by the sign + or -; as, x + y + z, or ax + 2b - c2.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.