The Collaborative International Dictionary of English v.0.48:
Showroom \Show"room`\, n. A room or apartment where a show is exhibited. [1913 Webster] 2. A room where merchandise is exposed for sale, or where samples are displayed. [1913 Webster]WordNet (r) 3.0 (2006):
showroom n 1: an area where merchandise (such as cars) can be displayed; "in Britain a showroom is called a salesroom" [syn: showroom, salesroom, saleroom]