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sesquioxide

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

noun

, Chemistry.
  1. an oxide containing three atoms of oxygen and two of another element, as aluminum oxide, Al 2 O 3 .


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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Word History and Origins

Origin of sesquioxide1

First recorded in 1825–35; sesqui- + oxide
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Example Sentences

After the vomiting, give hydrated sesquioxide of iron in tablespoon doses, every fifteen minutes, until danger is past.

A general antidote for all cases of poisoning, where the nature of the poison is unknown, is a mixture of carbonate of magnesia, powdered charcoal, and hydrated sesquioxide of iron, equal parts, in water.

The ammonia escapes, and may be detected by its smell; while the hydrogen H2, finding itself in contact with the oxide of manganese, 2MnO2, seizes one atom of its oxygen, O, becoming thereby converted into water H2O; while the manganese dioxide, 2MnO2, by losing one atom of oxygen, is reduced to the form of a lower oxide of manganese, known as manganese sesquioxide, Mn2O3.

Sesquioxide of chromium imparts a beautiful green colour to glass, while oxide of uranium produces an opalescent effect of yellow with a tinge of green.

Appended are two analyses of pyrolusite containing sesquioxide of iron.

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sesquicentennialsesquipedalian