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