[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 .

1825–35; sesqui- + oxide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sesquioxide (ˌsɛskwɪˈɒksaɪd)
any of certain oxides whose molecules contain three atoms of oxygen for every two atoms of the element: chromium sesquioxide, Cr2O3

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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