D defs.my
Entry 1 sense Webster, 1913

Treadmill

/trĕd'-mĭlˌ/ · Tread·mill · IPA /ˈtɹɛd.mɪl/
01 n. A mill worked by persons treading upon steps on the periphery of a wide wheel having a horizontal axis. It is used principally as a means o…
  1. 1.
    A mill worked by persons treading upon steps on the periphery of a wide wheel having a horizontal axis. It is used principally as a means of prison discipline. Also, a mill worked by horses, dogs, etc., treading an endless belt.