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Related to Monotomic: polyatomic


Occurring as single atoms: Helium is a monatomic gas.

mon′a·tom′ic·al·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˌmɒnəˈtɒmɪk) or


1. (Chemistry) (of an element) having or consisting of single atoms: argon is a monatomic gas.
2. (Chemistry) (of a compound or molecule) having only one atom or group that can be replaced in a chemical reaction
3. (Chemistry) a less common word for monovalent
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌmɒn əˈtɒm ɪk)

1. having one atom in the molecule.
2. containing one replaceable atom or group.
3. having a valence of one.
mon`a•tom′i•cal•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.monatomic - of or relating to an element consisting of a single atommonatomic - of or relating to an element consisting of a single atom; "helium and argon are monatomic gases"
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References in periodicals archive ?
In the limit of infinite potential barrier diatomic and off-centered monotomic impurities align themselves along certain preferred crystallographic directions.
A monotomic improvement in conductivity is obtained up to 100 times, but beyond that the polymer chains are pulled past each other without additional orientation or conductivity improvement.
These topics included rate monotomic scheduling of Ada tasks, partitioning of Ada programs for distributed execution, techniques for improving fault tolerancy of Ada applications, and the processing of asynchronous events.