atomic mass

SEE SYNONYMS FOR atomic mass ON THESAURUS.COM

noun Chemistry.

the mass of an isotope of an element measured in units formerly based on the mass of one hydrogen atom taken as a unit or on 1/16 (0.0625) the mass of one oxygen atom, but after 1961 based on 1/12 (0.0833) the mass of the carbon-12 atom. Abbreviation: at. m.

Origin of atomic mass

First recorded in 1895–1900

Words nearby atomic mass

atomic energy authority, atomic energy commission, atomic force microscope, atomic heat, atomic hydrogen, atomic mass, atomic mass unit, atomic number, atomic orbital, atomic pile, atomic power

British Dictionary definitions for atomic mass

atomic mass

noun chem

the mass of an isotope of an element in atomic mass units
short for relative atomic mass See atomic weight

Medical definitions for atomic mass

atomic mass

n.

The mass of an atom, usually expressed in atomic mass units.

Scientific definitions for atomic mass

atomic mass

The mass of a given atom or molecule, expressed in atomic mass units. Compare atomic weight. See also mass number.