The Collaborative International Dictionary of English v.0.48:

Reim \Reim\ (r?m), n. [D. riem, akin to G riemen; CF. Gr. ???? a
   towing line.]
   A strip of oxhide, deprived of hair, and rendered pliable, --
   used for twisting into ropes, etc. [South Africa] --Simmonds.
   [1913 Webster]