drone - definition and synonyms

noun [countable] 

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/drəʊn/
singulardrone
pluraldrones
  1. 1
    a low continuous sound

    the drone of the planes overhead

  2. 2
    a type of male bee that does not do any work
  3. 4
    an aircraft that does not have a pilot but is controlled from the ground
     Synonyms and related words