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periscope

The definition of a periscope is a set of lenses, mirrors or prisms on a tube allowing the viewer to see objected reflected on the other end.

(noun)

An example of a periscope is the viewing tool used on a submarine.

See periscope in Webster's New World College Dictionary

noun

a periscopic lens
an optical instrument consisting of a tube holding a system of lenses and mirrors or prisms, so arranged that a person looking through the eyepiece at one end can see objects reflected at the other end: used on submerged submarines, etc.

Origin: peri- + -scope

See periscope in American Heritage Dictionary 4

noun

Any of various tubular optical instruments that contain reflecting elements, such as mirrors and prisms, to permit observation from a position displaced from a direct line of sight.

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