UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈgriːnhaʊs/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈgrinˌhaʊs/ ,USA pronunciation: respelling(grēnhous′)

Inflections of 'greenhouse' (nnoun: Refers to person, place, thing, quality, etc.): nplplural noun: Noun always used in plural form--for example, "jeans," "scissors.": greenhouses

WordReference Random House Learner's Dictionary of American English © 2020
green•house /ˈgrinˌhaʊs/USA pronunciation   n. [countable]
  1. a building, room, or area, usually chiefly of glass, used for growing tender plants or plants out of season.

WordReference Random House Unabridged Dictionary of American English © 2020
green•house  (grēnhous′),USA pronunciation n., pl.  -hous•es 
    (grēnhous′),USA pronunciation 
  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.
  • green + house 1655–65

Collins Concise English Dictionary © HarperCollins Publishers::
greenhouse /ˈɡriːnˌhaʊs/ n
  1. a building with transparent walls and roof, usually of glass, for the cultivation and exhibition of plants under controlled conditions
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