'Treadwheel' definitions:

Definition of 'treadwheel'

(from WordNet)
noun
A mill that is powered by men or animals walking on a circular belt or climbing steps [syn: treadmill, treadwheel, tread-wheel]

Definition of 'Treadwheel'

From: GCIDE
  • Treadwheel \Tread"wheel`\, n. A wheel turned by persons or animals, by treading, climbing, or pushing with the feet, upon its periphery or face. See Treadmill. [1913 Webster]