(definition) by Webster 1913 Wed Dec 22 1999 at 3:03:14

Ses`qui*ox"ide (?), n. [Sesqui- + oxide.] Chem.

An oxide containing three atoms of oxygen with two atoms (or radicals) of some other substance; thus, alumina, Al2O3 is a sesquioxide.

 

© Webster 1913.

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