2 definitions found From WordNet (r) 2.0 [wn]: pentoxide noun: an oxide containing five atoms of oxygen in the molecule From The Collaborative International Dictionary of English v.0.44 [gcide]: Pentoxide \Pen*tox"ide\, noun [Penta- + oxide.] (Chem.) An oxide containing five atoms of oxygen in each molecule; as, phosphorus pentoxide, {P2O5}.

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