triatomic

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tri·a·tom·ic

 (trī′ə-tŏm′ĭk)
adj.
Containing three atoms.

triatomic

(ˌtraɪəˈtɒmɪk)
adj
(Chemistry) chem having three atoms in the molecule
ˌtriaˈtomically adv

tri•a•tom•ic

(ˌtraɪ əˈtɒm ɪk)

adj.
1. having three atoms in a molecule.
2. having three replaceable atoms or radicals.
[1860–65]
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