Waywiser
Pronunciation : Way"wis`er
Part of Speech : n.
Etymology : [Cf. G. wegweiser a waymark, a guide; weg way + weisen to show, direct.]
Definition : Defn: An instrument for measuring the distance which one has traveled on the road; an odometer, pedometer, or perambulator. The waywiser to a coach, exactly measuring the miles, and showing them by an index. Evelyn.
Source : Webster's Unabridged Dictionary, 1913