Definition of “molecule” - English Dictionary

“molecule” in British English

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moleculenoun [ C ]

uk /ˈmɒl.ɪ.kjuːl/ us /ˈmɑː.lɪ.kjuːl/

the simplest unit of a chemical substance, usually a group of two or more atoms

molecular
adjective uk /məˈlek.jə.lər/ us /məˈlek.jə.lɚ/

(Definition of “molecule” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“molecule” in American English

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moleculenoun [ C ]

us /ˈmɑl·əˌkjul/

science the smallest unit into which a substance can be divided without chemical change, usually a group of two or more atoms

molecular
adjective [ not gradable ] us /məˈlek·jə·lər/

(Definition of “molecule” from the Cambridge Academic Content Dictionary © Cambridge University Press)