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sesquioxide

[ses-kwee-ok-sahyd, -sid] /ˌsɛs kwiˈɒk saɪd, -sɪd/
noun, Chemistry.
1.
an oxide containing three atoms of oxygen and two of another element, as aluminum oxide, Al 2 O 3 .
Origin of sesquioxide
1825-1835
First recorded in 1825-35; sesqui- + oxide
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for sesquioxide

sesquioxide

/ˌsɛskwɪˈɒksaɪd/
noun
1.
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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