hothouse (n.)youdaoicibaDictYouDict[hothouse 词源字典]
mid-15c., "bath house," from hot + house (n.). In 17c. a euphemism for "brothel" (similar to massage parlor); the meaning "glass-roofed structure for raising plants" is from 1749. Figurative use by 1802.[hothouse etymology, hothouse origin, 英语词源]