periscope
Word family nounperiscopeadjectiveperiscopic
per·i·scope /ˈperəskəʊp $ -skoʊp/ noun [countableC] TTWPMNa long tube with mirrors fitted in it, used to look over the top of something, especially to see out of a submarine 〔尤指潜艇上用的〕潜望镜 Origin periscope (1800-1900) peri- (from Greek; PERICARDIUM) + Greek skopos “look”