Webster's English Dictionary

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placard

1. plac.ard \'plak-.a:rd, -*rd\ n [ME placquart, a formal document, fr. MF, 
   fr. plaquier to plate -] more at PLAQUE 1: a notice posted in a public 
   place : POSTER  2: a small card or metal plaque 
2. placard vt 1a: to cover with or as if with posters  1b: to post in a 
   public place  2: to announce by or as if by posting