The Collaborative International Dictionary of English v.0.48:

Gangrene \Gan"grene\, v. t. & i. [imp. & p. p. Gangrened; p.
   pr. & vb. n. Gangrening.] [Cf. F. gangr['e]ner.]
   To produce gangrene in; to be affected with gangrene.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "gangrened":
   bad, cankered, carious, contaminated, corrupt, decayed, decomposed,
   diseased, festering, foul, gangrenous, gone bad, infected, morbid,
   mortified, necrosed, necrotic, pathological, peccant, poisoned,
   putrefied, putrescent, putrid, rotten, rotting, septic,
   sphacelated, spoiled, suppurating, suppurative, tainted, ulcerated,
   ulcerous