sau·na 
/ˈsɑ:nə/ noun
plural sau·nas /ˈsɑ:nə/ noun [count] 1 : a special heated room in which people sit or lie down in order to get hot and sweat
▪ The health club has a pool and a sauna. 2 : a health treatment in which people sit or lie down in a sauna
▪ He talked about the benefits of taking/having a sauna regularly.
▪ The health club has a pool and a sauna.
▪ He talked about the benefits of taking/having a sauna regularly.
