D defs.my
Entry 3 senses Webster, 1913

exerciser

/ĕk'-sẽrs-īzˌ-ẽr/ · ex·er·ci·ser · IPA /ˈɛksərsˌaɪzər/
01 n. One who exercises.
  1. 1.
    One who exercises.
  2. 2.
    one who supervises the exercise of animals, such as horses or dogs.
  3. 3.
    a device used for exercising muscles; as, a thigh exerciser.