The Collaborative International Dictionary of English v.0.48:

Degender \De*gen"der\, Degener \De*gen"er\, v. i. [See
   Degenerate.]
   To degenerate. [Obs.] "Degendering to hate." --Spenser.
   [1913 Webster]

         He degenereth into beastliness.          --Joye.
   [1913 Webster]