Webster's English Dictionary

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plaque

plaque \'plak\ n [F, fr. MF, metal sheet, fr. plaquier to plate, fr. MD 
   placken to p]iece, patch; akin to MD placke piece, MHG placke patch 1a: an 
   ornamental brooch; esp : the badge of an honorary order  1b: a flat thin 
   piece (as of metal) used for decoration  1c: a commemorative or identifying 
   inscribed tablet  2: a localized abnormal patch on a body part or surface