having one atom in the molecule.
containing one replaceable atom or group.
having a valence of one.
Origin of monatomic
Related formsmon·a·tom·i·cal·ly, adverb
First recorded in 1840–50; mon-
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for monatomic
Historical Examples of monatomic
If this should prove to be the case, it will favour the view that chlorine itself is molecular and not monatomic.
The molecule of iodine, for example, is monatomic at 1200 C., but becomes diatomic at the ordinary temperature.
This information does not inform, since there is a vast number of monatomic alcohols and of every description.
The cadmium molecule, as shown by determinations of the density of its vapour, is monatomic.
All of them are believed to be monatomic—that is to say, each of their molecules is composed of a single atom.
British Dictionary definitions for monatomic
(of an element) having or consisting of single atomsargon is a monatomic gas
(of a compound or molecule) having only one atom or group that can be replaced in a chemical reaction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Related formsmon′a•tom′ic•al•ly adv.
Occurring as single atoms.
Having one replaceable atom or radical.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.