Dictionary/防空ぼうくうBoukuu防空 (Boukuu) is a Japanese noun meaning “air defense, air defence”.Meaningsnounair defense; air defenceKanji in 防空防ward off空emptyRelated words開くto open (e.g. doors)空emptiness空sky開けるto open (a door, etc.)空くto become less crowded空気air防犯カメラsecurity camera空港airport防ぐto defend against空間space防犯prevention of crime空っぽempty