atomic mass unit Definition in the Cambridge English Dictionary
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Definition of “atomic mass unit” - English Dictionary

Definition of "atomic mass unit" - American English Dictionary

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atomic mass unitnoun [C]

 us   /əˈtɑm·ɪk ˈmæs ˌju·nɪt/
chemistry, physics one-twelfth the mass of one ​atom of ​carbon
(Definition of atomic mass unit from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "atomic mass unit" - British English Dictionary

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atomic mass unitnoun [C]

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