'Triatomic' definitions:

Definition of 'Triatomic'

From: GCIDE
  • 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. [1913 Webster]