Wordnet 3.0
VERB (2)
1. 
 make opaque; 
- Example: "The glass was opacified more greater privacy"2. 
 become opaque; 
- Example: "the tissue in the eye's cornea may opacify and the patient may go blind"
WordNet (r) 3.0 (2006):
opacify
    v 1: make opaque; "The glass was opacified more greater privacy"
    2: become opaque; "the tissue in the eye's cornea may opacify
       and the patient may go blind"