The Collaborative International Dictionary of English v.0.48:

Sphacelate \Sphac"e*late\, v. i. [imp. & p. p. Sphacelated; p.
   pr. & vb. n. Sphacelating.] [NL. sphacelare, sphacelatum,
   mortify: cf. F. sphac['e]ler. See Sphacelus.] (Med.)
   To die, decay, or become gangrenous, as flesh or bone; to
   mortify.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sphacelate \Sphac"e*late\, v. t. (Med.)
   To affect with gangrene.
   [1913 Webster] Sphacelate

The Collaborative International Dictionary of English v.0.48:

Sphacelate \Sphac"e*late\, Sphacelated \Sphac"e*la`ted\, a.
   (Med.)
   Affected with gangrene; mortified.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sphacelate
    v 1: undergo necrosis; "the tissue around the wound necrosed"
         [syn: necrose, gangrene, mortify, sphacelate]