Source : Webster's Revised Unabridged Dictionary (1913)

Showroom \Show"room`\, n.
   A room or apartment where a show is exhibited.

   2. A room where merchandise is exposed for sale, or where
      samples are displayed.

Source : WordNet®

showroom
     n : an area where merchandise (such as cars) can be displayed;
         "in England a showroom is called a salesroom" [syn: {salesroom},
          {saleroom}]