viewing apparatus on a submarine, by which objects in a horizontal view may be seen through a vertical tube, 1899, formed in English from peri- "around" + -scope "instrument for viewing." Earlier (1865) a technical term in photography. Related: Periscopic.
periphery
periphrasis
periphrastic
periplum
Periscian
periscope
perish
perishable
peristalsis
peristaltic
peristyle
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