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



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 Originlate 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