noun, plural greenhouses [green-hou-ziz] .
a building, room, or area, usually chiefly of glass, in which the temperature is maintained within a desired range, used for cultivating tender plants or growing plants out of season.

1655–65; green + house Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
greenhouse (ˈɡriːnˌhaʊs)
a building with transparent walls and roof, usually of glass, for the cultivation and exhibition of plants under controlled conditions

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Almost no climatologists now dispute the idea that greenhouse gases in the
  atmosphere are heating up our planet.
Buying used textbooks not only saves you money, but cuts down on greenhouse
  gases caused by the manufacturing of new textbooks.
Even if continuing stagnation should slow greenhouse gas-caused climate change,
  the damage already done is extremely serious.
Coal plants, meanwhile, produce almost twice the volume of greenhouse gases as
  natural-gas plants per unit of energy generated.
Images for greenhouse
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