潜せん望ぼう鏡きょうせんぼうきょうFreq.FrequencyTop 50,000Meanings1nounperiscopeAn optical instrument used in submarines or armored vehicles to observe the surface or surroundings while remaining hidden.潜せん水すい艦かんの艦かん長ちょうは潜せん望ぼう鏡きょうで海かい上じょうを確かく認にんし