From Longman Dictionary of Contemporary Englishemergency roomeˈmergency ˌroom noun [countable] American EnglishMH a part of a hospital that immediately helps people who have been hurt in an accident or who are extremely ill SYN ER, casualty British English
Examples from the Corpus
emergency room• Between 1983 and 1994, emergency room admissions due to meth-related psychoses rose 366 percent in California.• They were also asked how much total waiting time elapsed between triage and departure from the emergency room.• The doctor in the emergency room notified the police.• At Massachusetts General, William Tisdale was a second-year medical resident in the emergency room.• A few years back the city closed down half of it, leaving only the emergency room open.• A 33-year-old man was brought to the emergency room in coma.• I made my way through a long corridor toward the emergency room. 