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English word periscope comes from English peri- (a word of Ancient Greek origin, meaning around or surrounding, near) and English -scope (another word of Ancient Greek origin, denoting an instrument for viewing)
peri- (English)
Around or surrounding:. Near:.
-scope (English)
Used to make terms denoting an instrument used for viewing or examination.
periscope (English)
(obsolete) : A general or comprehensive view.. A form of viewing device that allows the viewer to see things at a different height level and usually with minimal visibility. (intransitive) To rise and peer around, in the manner of a periscope.. (transitive, or, intransitive, Internet) To broadcast live video stream using Periscope (app) app via phone or tablet.