Search Result for "periscope": 
Wordnet 3.0

NOUN (1)

1. an optical instrument that provides a view of an otherwise obstructed field;


The Collaborative International Dictionary of English v.0.48:

Periscope \Per"i*scope\, 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]
WordNet (r) 3.0 (2006):

periscope n 1: an optical instrument that provides a view of an otherwise obstructed field
Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "periscope": Aqua-Lung, air cylinder, aquascope, bathyscaphe, bathysphere, benthoscope, diving bell, diving boat, diving chamber, diving goggles, diving helmet, diving hood, diving mask, diving suit, scuba, snorkel, submarine, swim fins, wet suit