위중한 상태의 환자를 24시간 내내 집중적으로 치료하고 관찰하는 병원 내의 특수 병동.
A hospital department for patients who are very ill and need constant care and monitoring.
예문:
"The patient was moved to the ICU after the surgery for close monitoring."
"Visiting hours in the ICU are strictly limited to immediate family members."
"He is a specialist doctor working in the ICU."