From The Collaborative International Dictionary of English v.0.48:

odograph \o"do*graph\, n. [Gr. "odo`s way + -graph.]
   1. A machine for registering the distance traversed by a
      vehicle or pedestrain.
      [Webster 1913 Suppl.]

   2. A device for recording the length and rapidity of stride
      and the number of steps taken by a walker.
      [Webster 1913 Suppl.]
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