The Collaborative International Dictionary of English v.0.48:

Restiform \Res"ti*form\ (r?s"t?*f?rm), a.[L. restis rope +
   -form.] (Anat.)
   Formed like a rope; -- applied especially to several ropelike
   bundles or masses of fibers on the dorsal side of the medulla
   oblongata.
   [1913 Webster]