intensive care unit
US /ɪnˌtensɪv ˈker juːnɪt/
UK /ɪnˌtensɪv ˈker juːnɪt/

1.
a special department of a hospital or health care facility that provides intensive care medicine
:
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The patient was transferred to the intensive care unit after surgery.
•
The hospital is expanding its intensive care unit to accommodate more critical patients.