noun
EXAMPLES FROM CORPUS
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And when they did, they moved very slowly, like a periscope .
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He scorned the use of a periscope , and stood and poked his head over the parapet.
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I've always found a periscope to be a very useful accessory in these conditions.
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Rear cockpit above features a periscope that seemingly makes the front occupant's head transparent.
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Their plan, which involves a periscope , works in unexpected ways.
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We upped periscope , identified it, then downed periscope.
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When I started circuit work that periscope , completely forgotten during the flight, made me jump just before touchdown.