conservatory

Short definition from Wiktionary

Adjective

1. 1
   Having the quality of preserving from loss, decay, or injury.
2. 2
   Relating to conservation.

Noun

1. 1
   That which preserves from injury.
2. 2
   A storehouse.
3. 3
   A large greenhouse or hothouse for the display of plants
4. 4
   A glass-walled and -roofed room in a house
5. 5
   A music school or a drama school