(also aˌtomic ˈmass ) noun
( chemistry ) the average mass of all the naturally occurring atoms of a chemical element
(also aˌtomic ˈmass ) noun
( chemistry ) the average mass of all the naturally occurring atoms of a chemical element
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005