無水亜砒酸 むすいあひさん Also written むすいあヒさん, 無水亜ヒ酸 Meanings Noun arsenic trioxide; white arsenic (As2O3) See also: 亜ヒ酸 (あひさん). Kanji 無 without. Read as ム. 水 water. Read as スイ. 亜 sub- 砒 arsenic 酸 acid. Read as サン. Jinuma: Japanese Dictionary · Word lists