periscope

[ per-uh-skohp ]
/ ˈpɛr əˌskoʊp /

noun

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.
a periscopic lens.

Origin of periscope

First recorded in 1815–25; back formation from periscopic

Example sentences from the Web for periscope

British Dictionary definitions for periscope

periscope
/ (ˈpɛrɪˌskəʊp) /

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

Word Origin for periscope

C19: from Greek periskopein to look around; see peri-, -scope

Scientific definitions for periscope

periscope
[ pĕrĭ-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.