Apa itu surgery? Apa itu surgery? The branch of medicine that deals with the diagnosis and treatment of injury, deformity, and disease by manual and instrumental means.A surgical operation or procedure, especially one involving the removal or replacement of a diseased organ or tissue.An operating room or a laboratory of a surgeon or of a hospital's surgical staff.The skill or work of a surgeon.Chiefly British A physician's, dentist's, or veterinarian's office.Chiefly British The period during which a physician, dentist, or veterinarian consults with or treats patients in the office.