Hypertext Webster Gateway: "sesquioxide"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
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