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  1. outer planet

    • n.
      a planet whose orbit lies outside the asteroid belt, i.e. Jupiter, Saturn, Uranus, or Neptune.
    • noun: outer planet, plural noun: outer planets

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    • IPA[ˈoudər ˈplanət]
    • n.
      a planet whose orbit lies outside the asteroid belt, i.e. Jupiter, Saturn, Uranus, or Neptune.

    Oxford American Dictionary

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