| pentoxide | <chemistry> An oxide containing five atoms of oxygen in each molecule; as, phosphorus pentoxide, P2O5. Origin: Penta- + oxide. Source: Websters Dictionary (01 Mar 1998) |
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| phosphorus pentoxide | P2O5;the ultimate anhydride of orthophosphoric acid; a drying and dehydrating agent; corrosive. (05 Mar 2000) |
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