Etymology
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periscope (n.)

viewing apparatus on a submarine, by which objects in a horizontal view may be seen through a vertical tube, 1899, formed in English from peri- "around" + -scope "instrument for viewing." Earlier (1865) a technical term in photography. Related: Periscopic.

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Definitions of periscope

periscope (n.)
an optical instrument that provides a view of an otherwise obstructed field;
From wordnet.princeton.edu