Definition of molecule noun from the Oxford Advanced American Dictionary

 

molecule

 noun
noun
NAmE//ˈmɑləˌkyul//
 
(chemistry)
 
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the smallest unit, consisting of a group of atoms, into which a substance can be divided without a change in its chemical nature A molecule of water consists of two atoms of hydrogen and one atom of oxygen.
NAmE//məˈlɛkyələr//
 
adjective [only before noun] molecular structure/biology
See the Oxford Advanced Learner's Dictionary entry: molecule