From Longman Dictionary of Contemporary Englishoperating roomˈoperating room noun [countable] American English MHan operating theatre
Examples from the Corpus
operating room• Mary had prepared an operating room.• George Cowley arrived at the hospital just as Doyle's now unconscious body was being wheeled into the emergency operating room.• For exam-ple, an emergency or operating room is not the best environment for monitoring subtle variations in heartbeats.• George asked the patient if he remembered the moment in the operating room when he heard that music.• In the operating room you can only see my eyes.• When he came to the centre I was already inside the operating room.• The reek poured unabated out of the operating room. 