atomic mass unit

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noun Physics.

Also called dalton . a unit of mass, equal to 1/12 (0.0833) the mass of the carbon-12 atom and used to express the mass of atomic and subatomic particles.

(formerly) a unit of mass, equal to 1/16 (0.0625) the mass of an oxygen atom having atomic mass 16. Abbreviations: amu, AMU

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Origin of atomic mass unit

First recorded in 1950–55

Words nearby atomic mass unit

atomic force microscope, atomic heat, atomic hydrogen, atomicity, atomic mass, atomic mass unit, atomic number, atomic pile, atomic power, atomics, atomic spectrum

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

How to use atomic mass unit in a sentence

Their bodies were later found incinerated and buried in mass graves outside of town.
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Beyond the huge American flag that hung over the street, the mile-long mass of cops ended.
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“Stay in formation,” a sergeant from the ceremonial unit said over a public address system to the cops along the street.
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My father was in an intelligence unit for the U.S. Navy, as he had been in World War II.
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“The United States had gone to war declaring it must destroy an active weapons of mass destruction program,” the Times reported.
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Charred beams and blackened walls showed stark and gaunt in the glow of a smoldering mass of wreckage.
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But hitherto, before these new ideas began to spread in our community, the mass of men and women definitely settled down.
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The Turks were no longer in mass but extended in several lines, less than a pace between each man.
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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.
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British Dictionary definitions for atomic mass unit

atomic mass unit

noun

a unit of mass used to express atomic and molecular weights that is equal to one twelfth of the mass of an atom of carbon-12. It is equivalent to 1.66 × 10 –27 kgAbbreviation: amu Also called: unified atomic mass unit, dalton

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 unit

atomic mass unit

A unit of mass equal to 112 the mass of an atom of carbon 12, which is assigned a mass of 12.dalton

Scientific definitions for atomic mass unit

atomic mass unit

A unit of mass equal to 112 the mass of an atom of the most common isotope of carbon (carbon 12), which is assigned a mass of 12 and has a value of 1.660 X 10-24 grams. A hydrogen atom has a mass of 1 atomic mass unit since its mass is 112 the mass of carbon 12. Also called dalton