noun Date: 1790 a weak unstable dibasic acid H 2 SO 3 known in solution and through its salts and used as a reducing and bleaching agent
SULFUROUS ACID
Meaning of SULFUROUS ACID in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012