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  1. Oxford American Dictionary

    micrometeoroid

    • IPA[ˌmīkrəˈmēdēəˌroid]

    美式

    • n.
      a microscopic particle in space or of extraterrestrial origin that is small enough so that if it enters the earth's atmosphere, it will not burn up but drift to the earth's surface instead.

    • noun: micrometeoroid, plural noun: micrometeoroids