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periscope

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periscope/ˈperəˌskoʊp/noun
pluralperiscopes
periscope
/ˈperəˌskoʊp/
noun
pluralperiscopes
Learner's definition of PERISCOPE  
[count]
: a long tube that contains lenses and mirrors and that is used to look over or around something and especially by a person in a submarine to see above the surface of the water
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