GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Periscope (?), n. [Pref. peri- + -scope.] A general or comprehensive view. [archaic]
   
   [1913 Webster]
   
   
   2. An optical instrument of tubular shape containing an arrangement of lenses and mirrors (or prisms), allowing a person to observe a field of view otherwise obstructed, as beyond an obstructing object or (as in submarines) above the surface of the water.
   
   [PJC]