catflap.org Online Dictionary Query

  emergency operation /ɪmˈɜːdʒənsi ˌɒpəɹˈeɪʃən/
  Notoperation , Sofortoperation 
     Synonyms: immediate operation, emergency surgery
  
   see: operation, surgery, surgical operation, surgical intervention, operative procedure, operations, surgeries, surgical operations, surgical interventions, operative procedures, exploratory operation, exploratory surgery, major surgery, minor surgery, spacer operation, dental surgery, tooth operation, undergo surgery, need surgery