an optical instrument for viewing objects that are above the level of direct sight or in an otherwise obstructed field of vision, consisting essentially of a tube with an arrangement of prisms or mirrors and, usually, lenses: used especially in submarines.
a periscopic lens.

1815–25; back formation from periscopic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
periscope (ˈpɛrɪˌskəʊp)
any of a number of optical instruments that enable the user to view objects that are not in the direct line of vision, such as one in a submarine for looking above the surface of the water. They have a system of mirrors or prisms to reflect the light and often contain focusing lenses
[C19: from Greek periskopein to look around; see peri-, -scope]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1899, formed in Eng. from peri- "around" + -scope "instrument for viewing." Earlier (1865) a technical term in photography.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
periscope   (pěr'ĭ-skōp')  Pronunciation Key 
An instrument that has angled mirrors or prisms and allows objects not in the direct line of sight to be seen, often used on submarines and in military reconnaissance.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They interpret the world through their own, somewhat limited, periscope.
No doubt, from an underground bunker with a periscope.
The van is equipped with a video camera and a periscope.
The periscope is mounted in a corner of a furnace to allow viewing of the entire field of the combustion space.
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