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atomic weight
atomicity
atomise, etc
atomism
atomize
atomizer
atomy
atonal
atonalism
atonality
atone
atonement
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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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