D defs.my
Entry 1 sense Webster, 1913

Treadwheel

/trĕd'-wēlˌ/ · Tread·wheel · IPA /trˈɛdwˌiːl/
01 n. A wheel turned by persons or animals, by treading, climbing, or pushing with the feet, upon its periphery or face. See Treadmill.
  1. 1.
    A wheel turned by persons or animals, by treading, climbing, or pushing with the feet, upon its periphery or face. See Treadmill. See: Treadmill