- gas gangrene, clostridial myonecrosis, emphysematous gangrene, emphysematous phlegmon, gangrenous emphysema, gas phlegmon, progressive emphysematous necrosis - (pathology) a deadly form of gangrene usually caused by Clostridium bacteria that produce toxins that cause tissue death; can be used as a bioweapon
--1 is a kind of gangrene, sphacelus, slough