conservatory
US /kənˈsɝː.və.tɔːr.i/
UK /kənˈsɝː.və.tɔːr.i/

1.
a room with a glass roof and walls, attached to a house and used as a sun lounge or for growing plants
:
•
They added a beautiful conservatory to their home, perfect for enjoying the garden year-round.
•
The old house had a charming conservatory filled with exotic plants.