Hypertext Webster Gateway: "trivalent"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Trivalent \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.
From WordNet (r) 1.7 (wn)
trivalent
adj : (chemistry) having a valence of three
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