The Collaborative International Dictionary of English v.0.48:

Ozonize \O"zo*nize\, v. t. [imp. & p. p. Ozonized; p. pr. &
   vb. n. Ozonizing.] (Chem.)
   (a) To convert into ozone, as oxygen.
   (b) To treat with ozone.
       [1913 Webster]