The Collaborative International Dictionary of English v.0.48:

hodometer \ho*dom"e*ter\ (h[-o]*d[o^]m"[-e]*t[~e]r), n. [Gr.
   "odo`metron, "odo`metros, an instrument for measuring
   distance; "odo`s way, path, road + me`tron measure: cf. F.
   odom['e]tre, hodom['e]tre. See also odometer.]
   A device for measuring the length of a path, consisting of a
   wheel of known circumference attached to a rod held in the
   hand, and pushed along a surface, which is usually the ground
   or a floor. The number of times the wheel makes a complete
   circle multiplied by the circumference is a measure of the
   length of the path traversed. It may be used to measure
   distances on curved as well as straight paths. A variant
   which registers the miles and rods traversed is sometimes
   used by surveyors.
   [PJC + 1913 Webster]

The Collaborative International Dictionary of English v.0.48:

odometer \o*dom"e*ter\ ([-o]*d[o^]m"[-e]*t[~e]r), n. [Gr.
   "odo`metron, "odo`metros, an instrument for measuring
   distance; "odo`s way + me`tron measure: cf. F. odom['e]tre,
   hodom['e]tre. See also hodometer.]
   An instrument attached to a vehicle or connected, as by a
   flexible cable, to the wheel of a vehicle, which measures the
   distance traversed.
   [1913 Webster]

   2. A hodometer.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

hodometer
    n 1: a meter that shows mileage traversed [syn: odometer,
         hodometer, mileometer, milometer]