sauna

1 ENTRIES FOUND:
sauna /ˈsɑːnə/ noun
plural saunas
sauna
/ˈsɑːnə/
noun
plural saunas
Britannica Dictionary definition of SAUNA
[count]
1 
: a special heated room in which people sit or lie down in order to get hot and sweat
2 
: a health treatment in which people sit or lie down in a sauna