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English definition of “periscope”

periscope

noun [C]     /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 .Parts of ships and boats
(Definition of periscope noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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