noun
stone bathtub
A bathtub made of stone, often found in traditional Japanese settings or hot spring resorts.
旅館の露天風呂には大きな石風呂があった。
The inn's open-air bath had a large stone bathtub.
noun
steam bath in a stone chamber
A steam bath taken inside a natural or man-made cavern or stone chamber, historically used for therapeutic purposes.
昔、この地域では石風呂に入って病気を治したと言われている。
It is said that people in this area used to cure illnesses by taking steam baths in stone chambers.