American English

Definition of periscope noun from the Oxford Advanced American Dictionary

 

periscope

 noun
noun
NAmE//ˈpɛrəˌskoʊp//
 
 
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a device like 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 ocean
See the Oxford Advanced Learner's Dictionary entry: periscope