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Webster's 1913 Dictionary

SESQUIOXIDE

Ses `qui *ox "ide, n. Etym: [Sesqui- + oxide. ] (Chem. )

 

Defn: An oxide containing three atoms of oxygen with two atoms (or radicals ) of some other substance; thus, alumina, Al2O3 is a sesquioxide.

 

New American Oxford Dictionary

sesquioxide

ses qui ox ide |ˌseskwēˈäkˌsīd ˌsɛskwiˈɑksaɪd | ▶noun Chemistry an oxide in which oxygen is present in the ratio of three atoms to two of another element.

 

Oxford Dictionary

sesquioxide

sesquioxide |ˌsɛskwɪˈɒksʌɪd | ▶noun Chemistry an oxide in which oxygen is present in the ratio of three atoms to two of another element.