conservatory

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A greenhouse, especially one in which plants are arranged aesthetically for display, as at a botanical garden.
• noun A school of music or dramatic art.

from The Century Dictionary.

• Having the quality of preserving from loss, decay, or injury.
• noun pl. conservatories (-riz).
• noun A preservative.
• noun A place for preserving or carefully keeping anything, as from loss, decay, waste, or injury; specifically, and commonly, a greenhouse for preserving exotics and other tender plants
• noun A place of public instruction and training, designed to promote the study of some branch of Science or art.

from the GNU version of the Collaborative International Dictionary of English.

• noun obsolete That which preserves from injury.
• noun A place for preserving anything from loss, decay, waste, or injury; particulary, a greenhouse for preserving exotic or tender plants.
• noun A public place of instruction, designed to preserve and perfect the knowledge of some branch of science or art, esp. music.
• adjective Having the quality of preserving from loss, decay, or injury.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A greenhouse or hothouse for the display of plants
• noun A school of music or drama; a conservatoire
• adjective rare pertaining to conservation
• noun obsolete That which preserves from injury.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a greenhouse in which plants are arranged in a pleasing manner
• noun the faculty and students of a school specializing in one of the fine arts
• noun a schoolhouse with special facilities for fine arts