| phosphorous | <chemistry> Of or pertaining to phosphorus; resembling or containing phosphorus; specifically, designating those compounds in which phosphorus has a lower valence as contrasted with phosphoric compounds; as, phosphorous acid, H3PO3. Origin: Cf. F. Phosphoreux. Source: Websters Dictionary (01 Mar 1998) |
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| phosphorous acid | H3PO3;its salts are phosphites. (05 Mar 2000) |
| phosphorous acids | Inorganic or organic derivatives of phosphorous acid (p(oh)3). Inorganic salts are known as phosphites. The tautomeric form of this compound (hpo(oh)2) = phosphonic acids. (12 Dec 1998) |