The Collaborative International Dictionary of English v.0.48:

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]

The Collaborative International Dictionary of English v.0.48:

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]

   Carbon dioxide. See Carbonic acid, under Carbonic.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dioxide
    n 1: an oxide containing two atoms of oxygen in the molecule