Vocabulary What does 防~ (ぼう~) mean? 防~ (ぼう~, bou~) means anti-, prevention of (prefix). Quick factsReadingぼう~Romajibou~Level (estimated, JLPT framework)N2 防~ぼう~N2 · estimated, JLPT frameworkbou~anti-, prevention of (prefix)Example sentencesこの時計(とけい)は防水(ぼうすい)です。This watch is waterproof.部屋(へや)を防音(ぼうおん)にしました。I soundproofed the room.Kanji in this word防defense, prevention; protection