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.
[1913 Webster]