The Collaborative International Dictionary of English v.0.48:

Reng \Reng\ (r?ng), n. [See Rank, n.]
   1. A rank; a row. [Obs.] "In two renges fair." --Chaucer.
      [1913 Webster]

   2. A rung or round of a ladder. [Obs.] --Chaucer.
      [1913 Webster]