opacify

[oh-pas-uh-fahy]
verb (used with object), opacified, opacifying.
1.
to cause to become opaque.
verb (used without object), opacified, opacifying.
2.
to become opaque.

Origin:
1910–15; < Latin opāc(us) shaded + -ify

opacification, noun
opacifier, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
opacify

verb
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" 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
It is often helpful, especially in the abnormal mediastinum, to opacify vascular structures.
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