phosphorous acid

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noun Chemistry.
a colorless, crystalline, water-soluble acid of phosphorus, H3PO3, from which phosphites are derived.
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Origin of phosphorous acid

First recorded in 1785–95
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British Dictionary definitions for phosphorous acid

phosphorous acid

Also called: orthophosphorous acid a white or yellowish hygroscopic crystalline dibasic acid. Formula: H 3 PO 3Systematic name: phosphoric acid
any oxyacid of phosphorus containing less oxygen than the corresponding phosphoric acid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for phosphorous acid

phosphorous acid
[ fŏsfər-əs, fŏs-fôrəs ]

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 Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.