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The Collaborative International Dictionary
diatomic

diatomic \di`a*tom"ic\ (d[imac]`[.a]*t[o^]m"[i^]k), a. [Pref. di- + atomic.] (Chem.)

  1. Containing two atoms.

  2. Having two replaceable atoms or radicals.

Wiktionary
diatomic

a. (context chemistry of a molecule etc. English) Consisting of two atoms. n. (context chemistry English) A diatomic molecule or other species

WordNet
diatomic

adj. of or relating to a molecule made up of two atoms; "a diatomic molelcule"

Usage examples of "diatomic".

Monatomic hydrogen, however, is extremely unstable and reacts promptly to form diatomic hydrogen molecules, H2.

Note that this excludes the diatomic gases N2 and O2 that form the bulk of the atmosphere (78 and 20 percent respectively), and also the monatomic traces, argon and neon.