Source : Webster's Revised Unabridged Dictionary (1913)

Traverser \Trav"ers*er\, n.
   1. One who, or that which, traverses, or moves, as an index
      on a scale, and the like.

   2. (Law) One who traverses, or denies.

   3. (Railroad) A traverse table. See under {Traverse}, n.

Source : WordNet®

traverser
     n : someone who moves or passes across; "the traversers slowly
         ascended the mountain"