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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.]