noun
emergency outpatient care; emergency department; ER
Refers to the hospital department or service providing immediate outpatient care for acute illnesses or injuries, as opposed to inpatient admission.
夜中に熱が出たので、救急外来に行った。
I went to the emergency department because I had a fever in the middle of the night.
この病院の救急外来は24時間対応しています。
The emergency department at this hospital is open 24 hours.
Compound of 救急 (emergency) and 外来 (outpatient). The term is a modern medical expression with no obscure historical derivation.