Hypertext Webster Gateway: "pentoxide"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pentoxide \Pen*tox"ide\, n. [Penta- + oxide.] (Chem.)
An oxide containing five atoms of oxygen in each molecule;
as, phosphorus pentoxide, {P2O5}.
From WordNet (r) 1.7 (wn)
pentoxide
n : an oxide containing five atoms of oxygen in the molecule
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