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]