The Collaborative International Dictionary of English v.0.48:

Sursanure \Sur"sa*nure\, n. [(Assumed) OF. sursane["u]re. See
   Sur-, and Sane.]
   A wound healed or healing outwardly only. [Obs.]
   [1913 Webster]

         Of a sursanure
         In surgery is perilous the cure.         --Chaucer.
   [1913 Webster]