• WordNet 3.6
    • n treadwheel a mill that is powered by men or animals walking on a circular belt or climbing steps
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Webster's Revised Unabridged Dictionary
    • n Treadwheel A wheel turned by persons or animals, by treading, climbing, or pushing with the feet, upon its periphery or face. See Treadmill.
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Century Dictionary and Cyclopedia
    • n treadwheel A contrivance for utilizing the weight of men or animals to produce rotary motion, which can then be applied to various mechanical purposes. It is of two principal forms: A hollow cylinder set with the axis horizontal. An animal, as a dog, walks on the inner surface of the cylinder, to which battens are secured as a foothold, and thus revolves it.
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In literature:

Sometimes the savages seemed to enjoy the fun of climbing on the great creaking treadwheel, as though it were a game.
"Inca Land" by Hiram Bingham