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  1. Oxford American Dictionary

    elementary particle

    • IPA[ˌeləˈment(ə)rē ˈpärdəkəl]

    美式

    • n.
      any of various fundamental subatomic particles, including those that are the smallest and most basic constituents of matter (leptons and quarks) or are combinations of these (hadrons, which consist of quarks), and those that transmit one of the four fundamental interactions in nature (gravitational, electromagnetic, strong, and weak).

    • noun: elementary particle, plural noun: elementary particles