WordWeb Online

1. A person who habitually pretends to be something he is not
   - poseur
    
2. A person who poses for a photographer or painter or sculptor
   "the president didn't have time to be a poser so the artist worked from photos"
   - model
    
3. A particularly difficult or baffling question or problem
   - stumper, toughie, sticker

Derived forms: posers

See also: pose

Type of: aid, assistant, exhibitionist, help, helper, problem, show-off, supporter

Encyclopedia: Poser