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opaque

o·paque [ ō páyk ]


adjective 
Definition:
 
1. not transparent or translucent: impervious to light, so that images cannot be seen through it

2. not shiny: dull and without luster

3. hard to understand: obscure and unintelligible in meaning

4. physics impenetrable by radiation: impenetrable by a specific form of radiation



noun  (plural o·paques)
Definition:
 
material through which light cannot pass: something opaque, especially a photographic pigment

[15th century. Directly or via French< Latin opacus "shaded, dark"]

o·paque·ly adverb
o·paque·ness noun
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