phosphorous-acid

phosphorous acid

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

Origin:
1785–95

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Collins
World English Dictionary
phosphorous acid
 
n
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

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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.
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