ヒ酸さんひさんMeanings1nounarsenic acidchemistryChemical term for the compound H₃AsO₄. Used in specialized chemistry contexts.ヒ酸さんは毒どく性せいが強つよいため、取とり扱あつかいに注ちゅう意いが必ひつ要ようです。Arsenic acid is highly toxic, so it must be handled with care.