odometer

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]