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Definition of subatomic particle noun from the Oxford Advanced Learner's Dictionary

subatomic particle

noun

/ˌsʌbəˌtɒmɪk ˈpɑːtɪkl/

/ˌsʌbəˌtɑːmɪk ˈpɑːrtɪkl/

(physics)

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a very small piece of matter, such as an electron or a proton, that is smaller than an atom compare elementary particle

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See subatomic particle in the Oxford Learner's Dictionary of Academic English

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