The Collaborative International Dictionary of English v.0.48:

Surgery \Sur"ge*ry\ (s[^u]r"j[~e]r*[y^]), 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.
      [1913 Webster]

   2. A surgeon's operating room or laboratory.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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, surgery]
    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, surgery, surgical operation,
       surgical procedure, surgical process]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "surgery":
   X ray, abscission, amputation, antiseptic surgery, aseptic surgery,
   blood bank, bloodless surgery, butchering, cauterization, cautery,
   charity ward, chiroplasty, chopping, cleavage, clinic,
   consultation room, cryosurgery, cutting, delivery room,
   dental surgery, dichotomy, dispensary, electrocautery,
   electrolysis, electrolyzation, electroresection, electrosurgery,
   emergency, enucleation, examining room, excision, fever ward,
   fission, general surgery, heart surgery, hospital room,
   intensive care, isolation, labor room, laboratory, laceration,
   laser surgery, major surgery, maternity ward, minor surgery,
   mutilation, neurosurgery, nursery, open-heart surgery,
   operating room, operation, operative surgery, oral surgery,
   organ transplantation, orthopedic surgery, pharmacy,
   plastic surgery, prison ward, private room, prosthetics,
   radiosurgery, reconstructive surgery, recovery room, rending,
   reparative surgery, resection, ripping, scission, section,
   semi-private room, severance, slashing, slicing, splitting,
   surgical diathermy, surgical treatment, tearing, therapy,
   thoracic surgery, treatment room, urological surgery,
   veterinary surgery, ward



Bouvier's Law Dictionary, Revised 6th Ed (1856):

SURGERY, med. jur. That part of the healing art which relates to external
diseases; their treatment; and, specially, to the manual operations adopted
for their cure.
     2. Every lawyer should have some acquaintance with surgery; his
knowledge on this subject will be found useful in cases of homicide and
wounds.