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noun, Chemistry.
a colorless, crystalline, water-soluble acid of phosphorus, H 3 PO 3 , from which phosphites are derived.
Also called orthophosphorous acid. a white or yellowish hygroscopic crystalline dibasic acid. Formula: H3PO3 Systematic name phosphoric acid
any oxyacid of phosphorus containing less oxygen than the corresponding phosphoric acid
phosphorous acid
(fŏs’fər-əs, fŏs-fôr’əs)
A white or yellowish crystalline solid used as a reducing agent. It is hygroscopic (easily absorbs moisture from the atmosphere). Chemical formula: H3PO3.


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