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English definition of “subatomic”

subatomic

adjective     /ˌsʌb.əˈtɒm.ɪk/ US  /-ˈtɑː.mɪk/ specialized
smaller than or within an atom Extremely smallSmall
(Definition of subatomic adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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