Word Study
    pentoxide
WORDNET DICTIONARY
Noun pentoxide has 1 sense
CIDE DICTIONARY
pentoxide, n. [Penta- + oxide.]. 
                                            
                                         An oxide containing five atoms of oxygen in each molecule; as, phosphorus pentoxide, P2O5 .                                                                                 [1913 Webster]                                                                                                                    
                                                                                    
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