| Noun | 1. | ICU - a hospital unit staffed and equipped to provide intensive care hospital - a medical institution where sick or injured people are given medical or surgical care coronary care unit - a hospital unit specially staffed and equipped to treat patients with serious cardiac problems neonatal intensive care unit, NICU - an intensive care unit designed with special equipment to care for premature or seriously ill newborn social unit, unit - an organization regarded as part of a larger social group; "the coach said the offensive unit did a good job"; "after the battle the soldier had trouble rejoining his unit" |