orthophosphorous-acid

or·tho·phos·pho·rous ac·id

[awr-thuh-fos-fer-uhs, awr-thoh-fos-fawr-uhs, -fohr-]
noun Chemistry.
a white to yellowish, crystalline, hygroscopic, water-soluble solid, H 3 PO 3 , used chiefly in the synthesis of phosphites.
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orthophosphorous acid (ˌɔːθəʊˈfɒsfərəs) [Click for IPA pronunciation guide]
 
n
Also called: phosphorous acid a white or yellowish hygroscopic crystalline dibasic acid. Formula: H3PO3

Collins English Dictionary - Complete & Unabridged 10th Edition
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a chattering or flighty, light-headed person.
a scrap or morsel of food left at a meal.
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