Word Study
    triatomic
CIDE DICTIONARY
triatomic, a. [Pref. tri- + atomic.]. 
                                            
                                         Having three atoms; -- said of certain elements or radicals.                                                                                 [1913 Webster]                                                                                                                    
                                                                                    OXFORD DICTIONARY
triatomic, adj.  Chem.
1 having three atoms (of a specified kind) in the molecule.
2 having three replacement atoms or radicals.
                    1 having three atoms (of a specified kind) in the molecule.
2 having three replacement atoms or radicals.
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