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English definition of “periscope”

periscope

noun [C] uk   /ˈper.ɪ.skəʊp/ us    /-skoʊp/
a long, vertical tube containing a set of mirrors that gives you a view of what is above you when you look through the bottom of the tube: Periscopes are used in submarines to allow you to look above the surface of the water.
(Definition of periscope from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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