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;
Sanatory ordinances for the protection of public
health, such as quarantine, fever hospitals, draining,
etc. --De Quincey.
Note: Sanatory and sanitary should not be confounded.
Sanatory signifies conducive to health, while sanitary
has the more general meaning of pertaining to health.