Wiktionary
opacify
vb. (cx transitive English) To make opaque.
WordNet
opacify
v. make opaque; "The glass was opacified more greater privacy"
become opaque; "the tissue in the eye's cornea may opacify and the patient may go blind"
Usage examples of "opacify".
Rabbit can see, over the shoulders that crowd around his body like green cotton tummocks, the shadow of his heart on an X-ray monitor screen, a twitching palegray ghost dimly webbed by its chambered structure and darkened in snaky streaks and bulbous oblongs by injections of the opacifying dye.