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  1. Oxford Dictionary

    shepherd satellite

    • n.
      a small moon orbiting close to a planetary ring, especially of Saturn, and whose gravitational field confines the ring within a narrow band.

    • noun: shepherd satellite, plural noun: shepherd satellites

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    shepherd satellite

    • IPA[ˈSHepərd ˈsadlˌīt]
    • n.
      a small moon orbiting close to a planetary ring, especially of Saturn, and whose gravitational ...

    Oxford American Dictionary