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Meaning of TRIATOMIC

 
Webster's 1913 Dictionary
 
 Definition: 
\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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