con ‧ ser ‧ va ‧ to ‧ ry /kənˈsɜːvət ə ri $ -ˈsɜːrvətɔːri/ BrE AmE noun ( plural conservatories ) [countable]
1 . British English a room with glass walls and a glass roof, where plants are grown, that is usually added on to a house
2 . American English a conservatoire