orthophosphorous acid

American

[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, H 3 PO 3 , used chiefly in the synthesis of phosphites.

orthophosphorous acid British

/ ˌɔːθəʊˈfɒsfərəs /

noun

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

"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

Etymology

Origin of orthophosphorous acid

ortho- + phosphorous acid

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023