sesquioxide

[ses-kwee-ok-sahyd, -sid]

ses·qui·ox·ide

[ses-kwee-ok-sahyd, -sid]
noun Chemistry.
an oxide containing three atoms of oxygen and two of another element, as aluminum oxide, Al2O3.

Origin:
1825–35; sesqui- + oxide
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sesquioxide is always a great word to know.
So is oxidation. Does it mean:
the process or result of a chemical reaction to oxygen, or the deposit that forms on the surface of a metal as it oxidizes
a double sulfate analogous to potassium alum, as aluminum ammonium sulfate, with the formula R2SO4?X2(SO4)3?24H2O, where R is alkali metal or ammonium
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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