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Definition of: periscope
(per′ə·skōp) noun
1. An instrument consisting of a revolving prism capable of reflecting light rays down a vertical tube: used to guide submarine boats or to watch an enemy from a trench.
2. A special variety of photographic objective; a periscopic or wide–angled lens.
—per′i·scop′ic or ·i·cal (-skop′i·kəl) adjective
Showing the principle of reflection.
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