triatomic

Adjective

tri=a=tom=ic

CIDE DICTIONARY

triatomic, a. [Pref. tri- + atomic.].

Having three atoms; -- said of certain elements or radicals. [1913 Webster]

triatomic, adj. Chem.
1 having three atoms (of a specified kind) in the molecule.
2 having three replacement atoms or radicals.

For further exploring for "triatomic" in Webster Dictionary Online

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