orthophosphorous acid

[ awr-thuh-fos-fer-uhs, awr-thoh-fos-fawr-uhs, -fohr- ]
/ ˈɔr θəˈfɒs fər əs, ˌɔr θoʊ fɒsˈfɔr əs, -ˈfoʊr- /

noun Chemistry.

a white to yellowish, crystalline, hygroscopic, water-soluble solid, H3PO3, used chiefly in the synthesis of phosphites.

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Origin of orthophosphorous acid

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for orthophosphorous acid

orthophosphorous acid
/ (ˌɔːθəʊˈfɒsfərəs) /

noun

a white or yellowish hygroscopic crystalline dibasic acid. Formula: H 3 PO 3Also 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