n. In pathology, a necrosis or mortification of soft tissues when the parts affected become dry, hard, and dark in color (dry gangrene or mummification), or when, remaining soft and moist, the parts fall a prey to septic organisms and undergo putrefaction (moist gangrene or sphacelus).n. In botany, a disease ending in putrid decay.To produce a gangrene in; mortify; hence, figuratively, to cause decay or destruction in.To become mortified.