'Thoracotomy' definitions:

Definition of 'thoracotomy'

(from WordNet)
noun
Surgical incision into the chest walls opening up the pleural cavity

Definition of 'Thoracotomy'

From: GCIDE
  • Thoracotomy \Tho`ra*cot"o*my\, n. [Gr. ?, ?, thorax + ? to cut.] (Surg.) The operation of opening the pleural cavity by incision. [1913 Webster]