phosphorous acid

noun

Definition of phosphorous acid 

: a deliquescent crystalline acid H3PO3 used especially as a reducing agent and in making phosphites

First Known Use of phosphorous acid

1788, in the meaning defined above

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The first known use of phosphorous acid was in 1788

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phosphorous acid

noun

Medical Definition of phosphorous acid 

: a deliquescent crystalline acid H3PO3 used especially as a reducing agent and in making phosphites

More from Merriam-Webster on phosphorous acid

Britannica.com: Encyclopedia article about phosphorous acid

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