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Periscope

see synonyms of periscope

Noun

1. periscope

an optical instrument that provides a view of an otherwise obstructed field

WordNet Lexical Database for English. Princeton University. 2010.

Periscope

see synonyms of periscope
noun
any of a number of optical instruments that enable the user to view objects that are not in the direct line of vision, such as one in a submarine for looking above the surface of the water. They have a system of mirrors or prisms to reflect the light and often contain focusing lenses

Collins English Dictionary. Copyright © HarperCollins Publishers

Periscope

see synonyms of periscope
noun
1. 
a periscopic lens
2. 
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.

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

Periscope

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

The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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