sulfurous acid
noun
: a weak unstable dibasic acid H2SO3 known in solution and through its salts and used as a reducing and bleaching agent
Example Sentences
Recent Examples on the Web Otherwise, the sulfur dioxide released from the bubbling lava would turn the watery fluid in your eyes’ mucus membranes into sulfurous acid. 
Sofie Bates, Popular Mechanics, 30 June 2020
Sofie Bates, Popular Mechanics, 30 June 2020 Word History
First Known Use
1790, in the meaning defined above
Medical Definition
sulfurous acid
noun
: a weak unstable dibasic acid H2SO3 known in solution and through its salts and used as a reducing and bleaching agent and in medicine as an antiseptic
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