Meanings
nounatomic mass unit (plural atomic mass units)
plural atomic mass units
- physicalchemistryA unit of mass equal to 1/12 the mass of an atom of ¹²C (carbon-12, an isotope of carbon).
Synonyms: dalton, unified atomic mass unit
Synonyms & antonyms
nounA unit of mass equal to 1/12 the mass of an atom of ¹²C (carbon-12, an isotope of carbon).
Also see
Translations
Chinese Mandarin 原子質量單位 /原子质量单位
- 原子質量單位 /原子质量单位 (yuánzǐ zhìliàng dānwèi)a unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
Finnish atomimassayksikkö
- atomimassayksikköa unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
Hungarian atomi tömegegység
- atomi tömegegységa unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
Indonesian satuan massa atom
- satuan massa atoma unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
Irish aonad maise adamhaí
- aonad maise adamhaía unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
Malay unit jisim atom
- unit jisim atoma unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
Polish jednostka masy atomowej
- jednostka masy atomoweja unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
Portuguese unidade de massa atômica, u.m.a.
- unidade de massa atômicaa unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
- u.m.a.a unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
Tagalog isahin ng mulpikning bugat
- isahin ng mulpikning bugata unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
Vietnamese đơn vị khối lượng nguyên tử
- đơn vị khối lượng nguyên tửa unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
Cite this entry
APA
atomic mass unit. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/atomic%20mass%20unit
MLA
“atomic mass unit.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/atomic%20mass%20unit. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “atomic mass unit,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/atomic%20mass%20unit.
Source: atomic mass unit on Wiktionary, CC BY-SA 4.0.