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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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ortho-phosphorous 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
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