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orthophosphorous acid

[awr-thuh-fos-fer-uh s, awr-thoh-fos-fawr-uh s, -fohr-] /ˈɔr θəˈfɒs fər əs, ˌɔr θoʊ fɒsˈfɔr əs, -ˈfoʊr-/
noun, Chemistry.
a white to yellowish, crystalline, hygroscopic, water-soluble solid, H 3 PO 3 , used chiefly in the synthesis of phosphites.
Origin of orthophosphorous acid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for orthophosphorous acid

orthophosphorous acid

a white or yellowish hygroscopic crystalline dibasic acid. Formula: H3PO3 Also called phosphorous 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
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