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  1. Oxford American Dictionary

    periscope

    • IPA[ˈperəˌskōp]

    美式

    • n.
      an apparatus consisting of a tube attached to a set of mirrors or prisms, by which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight.

    • noun: periscope, plural noun: periscopes