1. a medical facility for the treatment of chronic illnesses, especially tuberculosis, or for convalescence
Usage: often historical
2. a health resort or spa where people go to recover from illness or improve their health

Examples

• The tuberculosis patients were sent to a mountain sanatorium for treatment.
• She spent three months at a sanatorium recovering from her surgery.
• The old sanatorium was converted into a luxury hotel.
• Many sanatoriums were built in the early 1900s to treat lung diseases.
• The Swiss sanatorium offered fresh air therapy and rest cures.
• After his breakdown, he checked into a private sanatorium.
• The sanatorium provided both medical care and peaceful surroundings.