Periscope



[per-uh-skohp] /ˈpɛr əˌskoʊp/

noun
1.
an optical instrument for viewing objects that are above the level of direct sight or in an otherwise obstructed field of vision, consisting essentially of a tube with an arrangement of prisms or mirrors and, usually, lenses: used especially in submarines.
2.
a periscopic lens.
/ˈpɛrɪˌskəʊp/
noun
1.
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
n.

viewing apparatus on a submarine, 1899, formed in English from peri- “around” + -scope “instrument for viewing.” Earlier (1865) a technical term in photography. Related: Periscopic.
periscope
(pěr’ĭ-skōp’)
An instrument that has angled mirrors or prisms and allows objects not in the direct line of sight to be seen, often used on submarines and in military reconnaissance.

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