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periscope
(redirected from periscopical)

   Also found in: Dictionary/thesaurus, Encyclopedia 0.01 sec.
periscope 
An optical instrument using two right angle reflectors in order to allow observation of an object from behind a shield or around an obstruction where direct vision is impossible. It has many applications, especially in the military forces (e.g. in tanks, submarines). See periscopic lens.


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