Webster's English Dictionary

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opaque

1. opaque \o--'pa-k\ aj [L opacus] 1: neither reflecting nor emitting light 
    2a: not transparent or translucent  2b: impervious to forms of radiant 
   energy other than visible light  3a: hard to understand or explain : 
   UNINTELLIGIBLE  3b: OBTUSE, STUPID  - opaque.ly av
2. opaque n : something that is opaque; specif : an opaque paint for 
   blocking  out portions of a photographic negative or print