periscope

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periscope /ˈperəˌskoʊp/ noun
plural periscopes
periscope
/ˈperəˌskoʊp/
noun
plural periscopes
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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