Source : Webster's Revised Unabridged Dictionary (1913)

Surgery \Sur"ge*ry\, n. [OE. surgenrie, surgerie; cf. OF.
   cirurgie, F. chirurgie, L. chirurgia, Gr. ?. See {Surgeon}.]
   1. The art of healing by manual operation; that branch of
      medical science which treats of manual operations for the
      healing of diseases or injuries of the body; that branch
      of medical science which has for its object the cure of
      local injuries or diseases, as wounds or fractures,
      tumors, etc., whether by manual operation or by medicines
      and constitutional treatment.

   2. A surgeon's operating room or laboratory.

Source : WordNet®

surgery
     n 1: the branch of medical science that treats disease or injury
          by operative procedures; "he is professor of surgery at
          the Harvard Medical School"
     2: a room where a doctor or dentist can be consulted; "he read
        the warning in the doctor's surgery"
     3: a room in a hospital equipped for the performance of
        surgical operations; "great care is taken to keep the
        operating rooms aseptic" [syn: {operating room}, {OR}, {operating
        theater}, {operating theatre}]
     4: a medical procedure involving an incision with instruments;
        performed to repair damage or arrest disease in a living
        body; "they will schedule the operation as soon as an
        operating room is available"; "he died while undergoing
        surgery" [syn: {operation}, {surgical operation}, {surgical
        procedure}, {surgical process}]