Definition of: opaque

(ō·pāk′) adjective
1. Impervious to light; not translucent.
2. Loosely, imperfectly transparent.
3. Imerevious to reason; unintelligent.
4. Impervious to radiant heat, electric radiation, etc.
5. Having no luster; dull.
6. Unintelligible; obscure: an opaque style.
7. Obs. Dark; lying in shadow. See synonyms under DARK.
—noun
1. Opacity; that which is opaque.
2. An opaque substance used to block out portions of a photographic negative or positive.
—v.t. o·paqued, o·paqu·ing
1. To make opaque.
2. To block out parts of with opaque, as a photographic negative or positive. [<L opacus shaded, darkended; after F opaque]
—o·paque′ly adverb
—o·paque′ness noun