sesquioxide

[ses-kwee-ok-sahyd, -sid]
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noun Chemistry.

an oxide containing three atoms of oxygen and two of another element, as aluminum oxide, Al2O3.

Origin of sesquioxide

First recorded in 1825–35; sesqui- + oxide
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for sesquioxide

sesquioxide

noun

any of certain oxides whose molecules contain three atoms of oxygen for every two atoms of the elementchromium sesquioxide, Cr 2 O 3
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012