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English definition of “periscope”

periscope

noun [C]  /ˈper·əˌskoʊp/ us  
a vertical tube containing mirrors that can give you a view of what is above you when you look through the bottom of the tube: The periscope of the submarine was visible just above the surface of the water.
(Definition of periscope from the Cambridge Academic Content Dictionary © Cambridge University Press)
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