One of the mysteries of the English language finally explained.
1A heating or forcing effect like that in a hothouse.
2Atmospheric Physics and Environmental Science= "greenhouse effect".
3Figurative and in extended use; especially an effect of making something grow rapidly or become extreme.
Mid 19th century. From hothouse + effect. Compare greenhouse effect.
hothouse effect/ˈhɒthaʊs ɪˌfɛkt/
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