say it: GREEN-hows
greenhouse is a noun and adjective meaning "a building with glass walls and roof; for the cultivation and exhibition of plants under controlled conditions". It carries 2 recorded senses.
a building with glass walls and roof; for the cultivation and exhibition of plants under controlled conditions
of or relating to or caused by the greenhouse effect
“greenhouse gases”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for greenhouse come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.