Source : Webster's Revised Unabridged Dictionary (1913)

Sanatorium \San`a*to"ri*um\, n. [NL. See {Sanatory}.]
   An establishment for the treatment of the sick; a resort for
   invalids. See {Sanitarium}.

Source : WordNet®

sanatorium
     n 1: a hospital for recuperation or for the treatment of chronic
          diseases [syn: {sanatarium}, {sanitarium}]
     2: pejorative terms for an insane asylum [syn: {Bedlam}, {booby
        hatch}, {crazy house}, {cuckoo's nest}, {funny farm}, {funny
        house}, {loony bin}, {madhouse}, {nut house}, {nuthouse},
        {snake pit}]