From Longman Dictionary of Contemporary Englishwaiting roomˈwaiting room noun [countable] DWAITa room for people to wait in, for example before they see a doctor, until their train arrives etc
Examples from the Corpus
waiting room• At one time it must have been a waiting room for clients.• In those days, the big waiting room looked like a Kurdish way station.• A few seconds later-they enter the main waiting room.• Wexford opened a latched horse-box door and entered the waiting room.• The interviewer should collect the interviewee, not have him sent for from the waiting room. 4.• There are tired murals of the Boston Tea Party on the waiting room walls and the chairs are stark and stiff.• Quinn decided he would be less vulnerable in another spot and removed himself to the waiting room. 