adjective Chemistry.
having one atom in the molecule.
containing one replaceable atom or group.
having a valence of one.
Also, monoatomic.

1840–50; mon- + atomic

monatomically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
monatomic or monoatomic (ˌmɒnəˈtɒmɪk, ˌmɒnəʊəˈtɒmɪk)
1.  (of an element) having or consisting of single atoms: argon is a monatomic gas
2.  (of a compound or molecule) having only one atom or group that can be replaced in a chemical reaction
3.  a less common word for monovalent
monoatomic or monoatomic

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

monatomic mon·a·tom·ic (mŏn'ə-tŏm'ĭk)

  1. Occurring as single atoms.

  2. Having one replaceable atom or radical.

  3. Univalent.

mon'a·tom'ic·al·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And monatomic hydrogen will all be gone in only a few days.
Atoms and monatomic ions produce colors by excitation and decay of electrons in
  their atomic orbitals.
Measurements could be taken that would show these characteristics for
  polyatomic gases, monatomic gases, and gas mixtures.
Secondly, liquid metals and alloys are typically monatomic.
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