Definition of whir noun from the Oxford Advanced American Dictionary

 

whir

 noun
(also whirr)noun
NAmE//wər//
 
(also whirring)[usually singular]
 
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a continuous low sound, for example the sound made by the regular movement of a machine or the wings of a bird the whir of a motor There was a whirring of machinery.
See the Oxford Advanced Learner's Dictionary entry: whir

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