The Collaborative International Dictionary of English v.0.48:

Ronion \Ron"ion\, Ronyon \Ron"yon\, n. [F. rogne scab, mange.]
   A mangy or scabby creature.
   [1913 Webster]

         "Aroint thee, with!" the rump-fed ronyon cries. --Shak.
   [1913 Webster] Ronne