per|i|scope

per|i|scope
per|i|scope «PEHR uh skohp», noun.
1. an instrument that allows those in a submarine or trench to see a view of the surface. It is a tube with an arrangement of prisms or mirrors that reflect light rays down a vertical tube. The periscope works on the principle that the angle of reflection equals the angle of incidence.
2. a periscopic lens.
[< Greek peri- around + -scope]
per´i|scope|like´, adjective.

Useful english dictionary. 2012.

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