atomic mass

[ uh-tom ik mas ]

/ əˈtɒm ɪk ˈmæs /

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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

Atomic Energy Commission, atomic force microscope, atomic heat, atomic hydrogen, atomicity, atomic mass, atomic mass unit, atomic number, atomic pile, atomic power, atomics

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use atomic mass in a sentence

Their bodies were later found incinerated and buried in mass graves outside of town.
Why Mexicans Are Enraged by Obama’s Big Tuesday Meeting|Ruben Navarrette Jr.|January 6, 2015|DAILY BEAST
Beyond the huge American flag that hung over the street, the mile-long mass of cops ended.
Funeral Protest Is Too Much for NYPD Union Boss|Michael Daly|January 5, 2015|DAILY BEAST
“The United States had gone to war declaring it must destroy an active weapons of mass destruction program,” the Times reported.
Political Memes That Absolutely Must Die in 2015|Asawin Suebsaeng|January 1, 2015|DAILY BEAST
Google itself has taken a break and put plans for mass production on hold.
You Were Wrong About Miley & Bitcoin: 2014’s Failed Predictions|Nina Strochlic|December 31, 2014|DAILY BEAST

A colleague overheard two conservative Mass. lawmakers talking about what “the gays” could do.
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Charred beams and blackened walls showed stark and gaunt in the glow of a smoldering mass of wreckage.
The Red Year|Louis Tracy
But hitherto, before these new ideas began to spread in our community, the mass of men and women definitely settled down.
The Salvaging Of Civilisation|H. G. (Herbert George) Wells
The Turks were no longer in mass but extended in several lines, less than a pace between each man.
Gallipoli Diary, Volume I|Ian Hamilton
Thus among the huge mass of accumulated commodities the simplest wants would go unsatisfied.
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Edward Winslow died; one of the first settlers of Plymouth colony, Mass., and afterwards its governor.
The Every Day Book of History and Chronology|Joel Munsell

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

Medical definitions for atomic mass

atomic mass

The mass of an atom, usually expressed in atomic mass units.

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.

atomic mass

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Origin of atomic mass

Words nearby atomic mass

Words related to atomic mass

How to use atomic mass in a sentence

British Dictionary definitions for atomic mass

Medical definitions for atomic mass

Scientific definitions for atomic mass