Source : Webster's Revised Unabridged Dictionary (1913)

Necrosis \Ne*cro"sis\, n. [NL., fr. gr. ?, fr. ? to make dead,
   to mortify, ? a dead body.]
   1. (med.) Mortification or gangrene of bone, or the death of
      a bone or portion of a bone in mass, as opposed to its
      death by molecular disintegration. See {Caries}.

Source : WordNet®

necrosis
     n : the localized death of living cells (as from infection or
         the interruption of blood supply) [syn: {mortification},
         {gangrene}, {sphacelus}]