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]

WordNet (r) 3.0 (2006):

ozonize
    v 1: convert (oxygen) into ozone [syn: ozonize, ozonise]