Triv″a‐lent (?), a. [Pref. tri- + L. valens, -entis, p. pr. See Valence.] (Chem.) Having a valence of three; capable of being combined with, substituted for, or compared with, three atoms of hydrogen; — said of triad atoms or radicals; thus, nitrogen is trivalent in ammonia.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.