Optics.(of certain lenses in special microscopes, cameras, etc.) giving distinct vision obliquely, or all around, as well as, or instead of, in a direct line.
2.
pertaining to periscopes or their use.
Also, per·i·scop·i·cal.
Origin: 1795–1805; < Greekperiskop(eîn) to look about (see peri-, -scope) + -ic
periscopic per·i·scop·ic (pěr'ĭ-skŏp'ĭk) adj. Of, relating to, or permitting the observation of objects from positions in or out of the direct line of sight.