atomic mass unit Meaning in Cambridge English Dictionary
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Meaning of "atomic mass unit" - English Dictionary

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atomic mass unitnoun [C]

uk   us   (abbreviation u) specialized
a unit used for measuring atomic mass, equal to one twelfth of the mass of an atom of carbon in its commonest form, carbon-12
(Definition of atomic mass unit from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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