sesquioxide

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

Origin of sesquioxide

First recorded in 1825–35; sesqui- + oxide
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British Dictionary definitions for sesquioxide

sesquioxide

noun
  1. any of certain oxides whose molecules contain three atoms of oxygen for every two atoms of the elementchromium sesquioxide, Cr 2 O 3
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