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atomic mass
[ uh-tom-ik mas ]
/ əˈtɒm ɪk ˈmæs /
See the most commonly confused word associated with mass number
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noun Chemistry.
the mass of an isotope of an element measured in units formerly based on the mass of one hydrogen atom taken as a unit or on 1/16 (0.0625) the mass of one oxygen atom, but after 1961 based on 1/12 (0.0833) the mass of the carbon-12 atom.
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Origin of atomic mass
First recorded in 1895–1900
Words nearby atomic mass
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use atomic mass in a sentence
What is specially of interest is that the indicated atomic mass of each of the constituents is a whole number.
Alchemy: Ancient and Modern|H. Stanley RedgroveThe best evidence that these particles are of atomic mass is furnished by their deflection in electric and magnetic fields.
A Brief Account of Radio-activity|Francis Preston Venable
British Dictionary definitions for atomic mass
atomic mass
noun chem
the mass of an isotope of an element in atomic mass units
short for relative atomic mass See atomic weight
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
Scientific definitions for atomic mass
atomic mass
The mass of a given atom or molecule, expressed in atomic mass units. Compare atomic weight. See also mass number.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.