The Collaborative International Dictionary of English v.0.48:

Sanatory \San"a*to*ry\, a. [LL. sanatorius, fr. L. sanare to
   heal. See Sanable.]
   Conducive to health; tending to cure; healing; curative;
   sanative.
   [1913 Webster]

         Sanatory ordinances for the protection of public
         health, such as quarantine, fever hospitals, draining,
         etc.                                     --De Quincey.
   [1913 Webster]

   Note: Sanatory and sanitary should not be confounded.
         Sanatory signifies conducive to health, while sanitary
         has the more general meaning of pertaining to health.
         [1913 Webster]