'Sesquioxide' definitions:
Definition of 'Sesquioxide'
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Sesquioxide \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.
[1913 Webster] Sesquipedal
