hothouse is a Noun
 A house kept warm to shelter tender plants and shrubs from the cold air; a place in which the plants of warmer climates may be reared, and fruits ripened.
 A bagnio, or bathing house. [Obs.] Shak.
 A brothel; a bagnio. [Obs.] B. Jonson.
 A heated room for drying green ware.
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