phosphorous acid

noun Chemistry.
a colorless, crystalline, water-soluble acid of phosphorus, H 3 PO 3 , from which phosphites are derived.

1785–95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phosphorous acid
1.  Also called: orthophosphorous acid, Systematic name: phosphoric acid a white or yellowish hygroscopic crystalline dibasic acid. Formula: H3PO3
2.  any oxyacid of phosphorus containing less oxygen than the corresponding phosphoric acid

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
phosphorous acid   (fŏs'fər-əs, fŏs-fôr'əs)  Pronunciation Key 
A white or yellowish crystalline solid used as a reducing agent. It is hygroscopic (easily absorbs moisture from the atmosphere). Chemical formula: H3PO3.
The American Heritage® Science Dictionary
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