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From The Collaborative International Dictionary of English v.0.48:
Waywiser \Way"wis`er\, n. [Cf. G. wegweiser a waymark, a guide; weg way + weisen to show, direct.] An instrument for measuring the distance which one has traveled on the road; an odometer, pedometer, or perambulator. [1913 Webster] The waywiser to a coach, exactly measuring the miles, and showing them by an index. --Evelyn. [1913 Webster]