i Register
In some senses, conservatory is marked as obsolete, rare, UK. Watch for register when choosing this word.
adj
Having the quality of preserving from loss, decay, or injury.
Relating to conservation.
noun
That which preserves from injury.
a conservatory of life
A storehouse.
noun
A large greenhouse or hothouse for the display of plants
A glass-walled and -roofed room in a house
A music school or a drama school