Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

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