The Collaborative International Dictionary of English v.0.48:
Glasshouse \Glass"house`\, n. A house where glass is made; a commercial house that deals in glassware. [1913 Webster]WordNet (r) 3.0 (2006):
glasshouse n 1: a building with glass walls and roof; for the cultivation and exhibition of plants under controlled conditions [syn: greenhouse, nursery, glasshouse]