(esp. among North American Indians) a special building used for cleansing and purifying one's body by sweating, in which heated water is poured over heated stones to produce steam.
sweat·house (swět'hous') n. Any of various permanent or portable structures typically heated by fire or by pouring water over hot stones and used by certain Native American peoples to induce sweating, as for medicinal, spiritual, or social purposes. Also called sweat lodge.