Noun

• S: (n) gangrene, sphacelus, slough (necrotic tissue; a mortified or gangrenous part or mass)
• S: (n) necrosis, mortification, gangrene, sphacelus (the localized death of living cells (as from infection or the interruption of blood supply))

Verb

• S: (v) necrose, gangrene, mortify, sphacelate (undergo necrosis) "the tissue around the wound necrosed"