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monatomic

Adjective

mon=a=tom=ic

WORDNET DICTIONARY

monatomic(a = adj.pert) monoatomic - of or relating to an element consisting of a single atom; "helium and argon are monatomic gases"

monatomic, adv. [Mon- + atomic.].

Consisting of, or containing, one atom; as, the molecule of mercury is monatomic. [1913 Webster]

monatomic, adj. Chem.
1 (esp. of a molecule) consisting of one atom.
2 having one replaceable atom or radical.

For further exploring for "monatomic" in Webster Dictionary Online