dioxide

Deutoxide \Deu*tox"ide\ (?; 104), n. [Pref. deut- + oxide.] (Chem.) A compound containing in the molecule two atoms of oxygen united with some other element or radical; -- usually called dioxide, or less frequently, binoxide. [1913 Webster]

Dioxide \Di*ox"ide\ (?; 104), n. [Pref. di- + oxide.] (Chem.) (a) An oxide containing two atoms of oxygen in each molecule; binoxide. (b) An oxide containing but one atom or equivalent of oxygen to two of a metal; a suboxide. [Obs.] [1913 Webster]