The Collaborative International Dictionary of English v.0.48:

Conservatoire \Con`ser"va*toire`\, n. [F.]
   A public place of instruction in any special branch, esp.
   music and the arts. [See Conservatory, 3].
   [1913 Webster]

WordNet (r) 3.0 (2006):

conservatoire
    n 1: a schoolhouse with special facilities for fine arts [syn:
         conservatory, conservatoire]