What does 酸 mean?
酸 is a Japanese noun meaning “acid” in English. It can also be translated as “sourness” depending on context. It is written as 酸 in kanji, さん in hiragana, and san in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
その物質は酸で処理しなければならない。
The substance must be treated with acid.