The Collaborative International Dictionary of English v.0.48:

Ren \Ren\ (r?n), v. t. & i.
   See Renne. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ren \Ren\, n.
   A run. [Obs.] --Chaucer.
   [1913 Webster]