atomic mass

Pronunciation:			u'tâmik mas
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Matching Terms:			atomic mass unit
WordNet Dictionary
	Definition:		[n]  (chemistry) the mass (in atomic mass units) of an isotope of an element
	See Also:		mass
Biology Dictionary
	Definition:		This is the average mass of the naturally occurring isotopes of an element; the value takes into account the different natural abundances of the isotopes. The value is expressed relative to the value of exactly 12 for carbon-12
	Synonyms:		atomic weight