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Definition of subatomic adjective from the Oxford Advanced Learner's Dictionary

subatomic

adjective

/ˌsʌbəˈtɒmɪk/

/ˌsʌbəˈtɑːmɪk/

[usually before noun] (physics)

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smaller than, or found in, an atom

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See subatomic in the Oxford Advanced American DictionarySee subatomic in the Oxford Learner's Dictionary of Academic English

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noun

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