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atomic clock
atomic cocktail
atomic demolition munition
atomic emission spectroscopy
atomic energy
atomic force microscope
atomic heat
atomic mass
atomic mass unit
atomic number
atomic particle
atomic physics
atomic radius
atomic reactor
atomic theory
atomic veteran
atomic weight
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atomic mass unit
a·tom·ic mass u·nit (plural a·tom·ic mass u·nits)


noun 
Definition:
 
measure of mass of atom: a unit used to express the masses of atoms and molecules, equal to one-twelfth of the mass of a carbon-12 atom or about 1.660 x 10-27 kg.
Symbol  u
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