hothouse

1. (figurative) An environment in which growth or development is encouraged naturally or artificially; a hotbed.Examples: "This had given him the strength to leave cadet school at seventeen and volunteer for active service, reach the rank of second lieutenant no later than his hothouse-bred contemporaries, begin his military studies in the General Staff Academy itself, and, still only twenty-five, graduate not only with top marks but with promotion out of turn for special excellence in military science."; "In 1906 and 1907 defeat was not yet total, society was still on the boil, spinning around the rim of the maelstrom. Lenin had sat in Kuokkala, waiting in vain for the second wave. But from 1908, when the reactionary rabble had tightened its grip on the whole of Russia, the underground had shriveled to nothing, the workers had swarmed like ants out of their holes and into legal bodies—trade unions and insurance associations—and the decline of the underground had sapped the vitality of the emigration too, reduced it to a hothouse existence. Back there was the Duma, a legal press—and every émigré was eager to publish there."; "A seed had been planted in Gillies's mind—and as he took up his next assignment, it would be nurtured in the brutal hothouse of frontline surgery."figuratively

2. (obsolete) A bagnio, or bathing house; a brothel.Examples: "Let a man ſweat once a weeke in a Hothouſe, and be well rubd and froted with a good plumpe juicie wench, and ſweet linnen, he ſhall ne’re ha’ the Poxe."; "and now she professes a / hot-house, which I think is a very ill house too."obsolete

3. (climatology) A hot state in global climate.Examples: "Kruban is a tidally-locked Venusian hothouse, its surface perpetually obscured by clouds of sulfur and carbon dioxides."Synonyms: greenhouseAntonyms: icehouse