English

Definition of molecule noun from the Oxford Advanced Learner's Dictionary

 

molecule

 noun
noun
BrE BrE//ˈmɒlɪkjuːl//
 
; NAmE NAmE//ˈmɑːlɪkjuːl//
 
(chemistry) Molecules and matter
 
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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. Wordfinderacid, catalyst, chemistry, compound, formula, molecule, pH, react, solution, valency Wordfinderamplitude, atom, energy, fission, force, frequency, gravity, molecule, nuclear, physics See related entries: Molecules and matter Word Origin late 18th cent.: from French molécule, from modern Latin molecula, diminutive of Latin moles ‘mass’.Extra examples the molecules in the crystal the number of atoms in a molecule two molecules of hydrogen
See the Oxford Advanced American Dictionary entry: molecule