Pronunciation: (ō-pas'i-tē), [key]
1. the state or quality of being opaque.
2. something opaque.
3. the degree to which a substance is opaque; capacity for being opaque.
4. Photog.the proportion of the light that is absorbed by the emulsion on any given area of a film or plate.
5. obscurity of meaning.
6. mental dullness.
7. Med.an opaque spot or area in normally clear or transparent tissue, as a cataract of the eye.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.