Definition of periscope noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈperɪskəʊp//
; NAmE NAmE//ˈperɪskoʊp//
Parts of boats and ships
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a device like a long tube, containing mirrors which 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 See related entries: Parts of boats and ships
See the Oxford Advanced American Dictionary entry: periscope