sesquioxide

[ses-kwee-ok-sahyd, -sid]
noun Chemistry.
an oxide containing three atoms of oxygen and two of another element, as aluminum oxide, Al 2 O 3 .

Origin:
1825–35; sesqui- + oxide

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World English Dictionary
sesquioxide (ˌsɛskwɪˈɒksaɪd)
 
n
any of certain oxides whose molecules contain three atoms of oxygen for every two atoms of the element: chromium sesquioxide, Cr2O3

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Example sentences
Kinetic evaluation of the bioavailability of organic ligand biodegradation in the presence of common sesquioxide grain coatings.
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