Meaning of “atomic mass” in the English Dictionary

british dictionary

(Definition of “atomic mass” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"atomic mass" in American English

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atomic massnoun [ U ]

us /əˈtɑm·ɪk ˈmæs/

chemistry, physics the total number of protons and neutrons in the nucleus (= central part) of an atom

(Definition of “atomic mass” from the Cambridge Academic Content Dictionary © Cambridge University Press)