What does 防水 mean?
防水 is a Japanese noun meaning “waterproofing; making watertight” in English. It is written as 防水 in kanji, ぼうすい in hiragana, and bousui in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
若いキャンパーたちは新しい防水上着を身につけていた。
The young campers were kitted out with new waterproof jackets.