Noun treadmill has 3 senses
  1. treadmill - an exercise device consisting of an endless belt on which a person can walk or jog without changing place
    --1 is a kind of
    exercise device
  2. treadmill, treadwheel, tread-wheel - a mill that is powered by men or animals walking on a circular belt or climbing steps
    --2 is a kind of mill, grinder
  3. treadmill, salt mine - a job involving drudgery and confinement
    --3 is a kind of occupation, business, job, line of work, line
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