Translate text 
Translate files Periscope
/ˈpɛrɪˌskoʊp/
Meaning & Definition
noun
An optical instrument used for viewing objects that are not in the direct line of sight.
The submarine crew used a periscope to observe the surface while remaining submerged.
A similar device used in other contexts, such as in tanks or other vehicles, to enable observation from a protected position.
The tank commander relied on the periscope to monitor enemy movements from a safe distance.
A tube with mirrors or prisms that is used to reflect and direct light, allowing one to see around obstacles.
He installed a periscope in his treehouse to keep an eye on the neighborhood.
Etymology
Derived from Greek 'peri' meaning 'around' and 'skopein' meaning 'to look or to examine'.
Common Phrases and Expressions
periscope view
A view obtained using a periscope, particularly in submarines.
raise the periscope
To elevate the periscope for observation, often used metaphorically to mean gaining a perspective.
Related Words
telescope
An instrument for observing distant objects by collecting and focusing light.
microscope
A scientific instrument used to see objects that are too small for the naked eye.
Slang Meanings
Looking around or spying
He was using his periscope to check out the scene without being seen.
Gaining insight or knowledge
I need to periscope into what's going on in the office.