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triatomic 三原子的 三原子的 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]
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