greenhouse

noun, plural green·hous·es [green-hou-ziz] /ˈgrinˌhaʊ zɪz/.

1. 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.

noun

1. a building with transparent walls and roof, usually of glass, for the cultivation and exhibition of plants under controlled conditions