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drone

noun [S] (NOISE)
 
 
/drəʊn/ US  /droʊn/

Definition

a low continuous noise that does not change its note: the drone of an engine Outside the tent I could hear the constant drone of insects. The drone of his voice made me feel sleepy.Sounds made by objects, movement or impact
(Definition of drone noun (NOISE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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