Sesquioxide

A sesquioxide is an oxide containing three atoms of oxygen with two atoms (or radicals) of another element. For example, aluminium oxide ({aluminium}2{oxygen}3) is a sesquioxide. Many sesquioxides contain the metal in the +3 oxidation state and the oxide ion, e.g., Al2O3, La2O3. The alkali metal sesquioxides are exceptions and contain both peroxid...
Found on http://en.wikipedia.org/wiki/Sesquioxide

Sesquioxide

• (n.) An oxide containing three atoms of oxygen with two atoms (or radicals) of some other substance; thus, alumina, Al2O3 is a sesquioxide.
Found on http://thinkexist.com/dictionary/meaning/sesquioxide/

Sesquioxide

Ses`qui·ox'ide noun [ Sesqui- + oxide .] (Chemistry) An oxide containing three atoms of oxygen with two atoms (or radicals) of some other substance; thus, alumina, Al 2 O 3 is a sesquioxide .
Found on http://www.encyclo.co.uk/webster/S/75
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