adjective, noun, verb, o⋅paqued, o⋅paqu⋅ing.| 1. | not transparent or translucent; impenetrable to light; not allowing light to pass through. |
| 2. | not transmitting radiation, sound, heat, etc. |
| 3. | not shining or bright; dark; dull. |
| 4. | hard to understand; not clear or lucid; obscure: The problem remains opaque despite explanations. |
| 5. | dull, stupid, or unintelligent. |
| 6. | something that is opaque. |
| 7. | Photography. a coloring matter, usually black or red, used to render part of a negative opaque. |
| 8. | Photography. to cover up blemishes on (a negative), esp. for making a printing plate. |
| 9. | to cause to become opaque. |

o·paque (ō-pāk') adj.
[Middle English opake, shady, and French opaque, opaque (from Old French, shady), both from Latin opācus.] o·paque'ly adv., o·paque'ness n. |
opaque o·paque (ō-pāk')
adj.
Impenetrable by light; neither transparent nor translucent.