Webster's English Dictionary

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overlay

1. over.lay \.o--v*r-'la-\ vt 1a: to lay or spread over or across : 
   SUPERIMPOSE  1b: to prepare an overlay for  2: OVERLIE 
2. overlay \'o--v*r-.\ n : a covering either permanent or temporary : as  : 
   an ornamental veneer  : paper patches added to the packing on a printing 
   press to make a strong er impression : a decorative and contrasting design 
   or article placed on top of a plain  one : a transparent sheet containing 
   graphic matter to be superimposed on ano ther sheet