n. Surgery of the chest, usually involving removal of ribs.
the GNU version of the Collaborative International Dictionary of English
n. A remodeling or reshaping of the thorax; especially, the operation of removing the ribs, so as to obliterate the pleural cavity in cases of empyema.
The Century Dictionary and Cyclopedia
n. Removal of a section of one or more ribs for the cure of a fistula of the chest-wall following empyema.