無む水すい亜あ砒ひ酸さんalso: むすいあヒさんむすいあひさんじ字FuriganaMeanings1nounarsenic trioxide; white arsenicrare termChemical compound As₂O₃; rare term, mainly used in technical or historical contexts. Also known as 亜砒酸 (arsenious acid).See also: 亜ヒ酸無