Source : Webster's Revised Unabridged Dictionary (1913)

Odometer \O*dom"e*ter\, n. [Gr. ?, ?, an instrument for
   measuring distances; ? way + ? measure: cf. F. odom[`e]tre,
   hodom[`e]tre.]
   An instrument attached to a vehicle, to measure the distance
   traversed; also, a wheel used by surveyors, which registers
   the miles and rods traversed. -- {Od`o*met"ric*al}, a.

Odometrical \O`do*met"ric*al\, a. [Cf. F. odom['e]trique,
   hodom['e]trique.]
   Of or pertaining to the odometer, or to measurements made
   with it.