sphacelus

from WordNet (r) 3.0 (2006)

sphacelus
    n 1: necrotic tissue; a mortified or gangrenous part or mass
         [syn: {gangrene}, {sphacelus}, {slough}]
    2: the localized death of living cells (as from infection or the
       interruption of blood supply) [syn: {necrosis},
       {mortification}, {gangrene}, {sphacelus}]

from The Collaborative International Dictionary of English v.0.48

Sphacelus \Sphac"e*lus\, n. [NL., fr. Gr. ????.] (Med.)
   Gangrenous part; gangrene; slough.
   [1913 Webster]