Meaning of atomic mass unit
atom'ic mass' u"nit
— Physics. Physics.
- Also calleda unit of mass, equal to 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 the mass of an oxygen atom having atomic mass 16. Abbr.: amu, AMU
- atomic mass unit (Thesaurus)