1. a small room or building designed to be heated to a high temperature for relaxation and health benefits
2. a session of sitting or lying in such a heated room

Examples

• The hotel spa features a traditional Finnish sauna.
• After our workout, we relaxed in the sauna for twenty minutes.
• The sauna was heated to 180 degrees Fahrenheit.
• She enjoys taking a sauna every weekend to unwind.
• The wooden benches in the sauna were uncomfortably hot.
• Many people believe regular sauna use has health benefits.
• We poured water on the hot stones to create more steam in the sauna.