Definition of "sesquioxide" []

• Any oxide containing three oxygen atoms for every two atoms of another element. (noun)

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• "The reason of this appears to be that a part of the manganese is first precipitated as hydrated sesquioxide, which is afterward oxidized to hydrated peroxide, for the upper portion of the liquid may sometimes be colored by chameleon, while the lower portion, which is in closer contact with the precipitate, is less colored or absolutely colorless."
• "Oxisols with sesquioxide clays also tend to be highly permeable."
• "The colouring matter of which is sesquioxide of iron, is used as a crayon."