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



BrE BrE//ˈætəm//
; NAmE NAmE//ˈætəm//
Molecules and matter
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the smallest particle (1) of a chemical element that can exist the splitting of the atom Two atoms of hydrogen combine with one atom of oxygen to form a molecule of water. The scientist Ernest Rutherford was the first person to split the atom. positively charged atoms Wordfinderamplitude, atom, energy, fission, force, frequency, gravity, molecule, nuclear, physics Wordfinderantiparticle, atom, electron, ion, neutron, nucleus, particle, positron, proton, valency See related entries: Molecules and matter Word Originlate 15th cent.: from Old French atome, via Latin from Greek atomos ‘indivisible’, based on a- ‘not’ + temnein ‘to cut’.
See the Oxford Advanced American Dictionary entry: atom

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