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periscope

noun
🔊/ˈperɪskəʊp/
🔊/ˈperɪskəʊp/
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  1. a device consisting of a long tube containing mirrors that enable the user to see over the top of something, used especially in a submarine (= a ship that can operate underwater) to see above the surface of the sea潜望镜Topics Transport by waterc2