Source : Webster's Revised Unabridged Dictionary (1913)

Nosocomial \Nos`o*co"mi*al\, a. [L. nosocomium a hospital, Gr.
   ?; ? disease + ? to attend to.]
   Of or pertaining to a hospital; as, nosocomial atmosphere.
   --Dunglison.

Source : WordNet®

nosocomial
     adj : taking place or originating in a hospital; "nosocomial
           infection"