DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   poser
       n 1: a person who habitually pretends to be something he is not
            [syn: poseur, poser]
       2: a person who poses for a photographer or painter or sculptor;
          "the president didn't have time to be a model so the artist
          worked from photos" [syn: model, poser]
       3: a particularly difficult or baffling question or problem
          [syn: poser, stumper, toughie, sticker]