tread-wheel, tread wheel

From tread +‎ wheel.

treadwheel (plural treadwheels)

1. A large wheel turned by treading, climbing, or pushing with the feet upon its periphery, as for example in a treadmill.
   • [1898], J[ohn] Meade Falkner, “A Funeral”, in Moonfleet (Arnold’s English Literature Series), London: Edward Arnold & Co., →OCLC, page 148:

     It is so deep no man can draw the buckets on a winch, but they must have an ass inside a treadwheel to hoist them up.

• walking wheel

• “treadwheel”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.