dial - definition and synonyms

noun [countable] 

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  1. 1
    the part of a clock or watch that is round and has hands that move to show you the time
    1. a.
      a round instrument on a machine that shows you the amount of something, for example heat or pressure
  2. 2
    a round control on a piece of equipment that you turn to change something such as the temperature or sound
  3. 3
    a circle with holes on an old-fashioned telephone, that you turn in order to call someone