[per-uh-skohp] 
| 1. | an optical instrument for viewing objects that are above the level of direct sight or in an otherwise obstructed field of vision, consisting essentially of a tube with an arrangement of prisms or mirrors and, usually, lenses: used esp. in submarines. |
| 2. | a periscopic lens. |
| per·i·scope (pěr'ĭ-skōp') n. Any of various tubular optical instruments that contain reflecting elements, such as mirrors and prisms, to permit observation from a position displaced from a direct line of sight. per'i·scop'ic (-skŏp'ĭk), per'i·scop'i·cal (-ĭ-kəl) adj. |
| periscope (pěr'ĭ-skōp') Pronunciation Key
An instrument that has angled mirrors or prisms and allows objects not in the direct line of sight to be seen, often used on submarines and in military reconnaissance. |
əˌskoʊp