pyopneumocholecystitis py·o·pneu·mo·cho·le·cys·ti·tis (pī'ō-n&oomacr;'mō-kō'lĭ-sĭ-stī'tĭs, -ny&oomacr;'-)
n.
The presence of pus and gas in an inflamed gallbladder, caused by gas-producing microorganisms or by the entry of air from the duodenum through the biliary ducts.