noun
( chemistry , physics ) the theory that all elements are made up of small particles called atoms which are made up of a central nucleus surrounded by moving electrons
noun
( chemistry , physics ) the theory that all elements are made up of small particles called atoms which are made up of a central nucleus surrounded by moving electrons
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005