atomnoun [ C ]uk /ˈæt.əm/ us /ˈæt̬.əm/
- The nucleus of a deuterium atom contains a proton and a neutron.
- Scientists are working to harness the power of the atom.
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(Definition of “atom” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to touch with your lips, especially as a greeting, or to press your mouth onto another person's mouth in a sexual way