| NOUN | substance | orthophosphorous acid, hypophosphorous acid, phosphorous acid | a clear or yellow monobasic acid (H3PO2) |
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| Meaning | A clear or yellow monobasic acid (H3PO2). | |
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| Synonyms | hypophosphorous acid, phosphorous acid | |
| Broader | oxyacid, oxygen acid | Any acid that contains oxygen |