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The meaning of PERISCOPE is a tubular optical instrument containing lenses and mirrors by which an observer obtains an otherwise obstructed field of view.
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. [ 1 ] [ 2 ] In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle.
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.
Periscope, optical instrument used in land and sea warfare, submarine navigation, and elsewhere to enable an observer to see his surroundings while remaining under cover, behind armour, or submerged. A periscope includes two mirrors or reflecting prisms to change the direction of the light coming.
noun. /ˈperɪskəʊp/. /ˈperɪskəʊp/. a device consisting of 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 sea Topics Transport by water c2.
periscope. noun [ C ] us / ˈper·əˌskoʊp /. Add to word list. a vertical tube containing mirrors that can give you a view of what is above you when you look through the bottom of the tube: The periscope of the submarine was visible just above the surface of the water.
A periscope is a tool you use to see things that would otherwise be hidden or obstructed. If you've ever been stuck in a submarine, curious about what's going on above water, then you've needed a periscope.