From WordNet (r) 2.0 (August 2003) [wn]:
grillroom
n : a restaurant where food is cooked on a grill [syn: grill]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Grillroom \Grill"room`\, n.
1. A room specially fitted for broiling food, esp. one in a
restaurant, hotel, or clubhouse, arranged for prompt
service.
[Webster 1913 Suppl.]
2. a restaurant where food is cooked on a grill. [WordNet
sense 1]
Syn: grill.
[WordNet 1.5]