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.
| opaque (ō-pāk') Pronunciation Key
Resistant to the transmission of certain kinds of radiation, usually light. Metals and many minerals are opaque to light, while being transparent to radio waves and neutrinos. Compare translucent, transparent. |