Hypertext Webster Gateway: "triatomic"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Triatomic \Tri`a*tom"ic\, a. [Pref. tri- + atomic.] (Chem.)
(a) Having three atoms; -- said of certain elements or
radicals.
(b) Having a valence of three; trivalent; sometimes, in a
specific sense, having three hydroxyl groups, whether
acid or basic; thus, glycerin, glyceric acid, and
tartronic acid are each triatomic.
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