Webster's English Dictionary

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whir

1. whir also whirr \'hw*r, 'w*r\ vb also whirred;  or whir.ring [ME (Sc) 
   quirren, prob. of Scand origin; akin to Dan hvirre to whir]l, whir; akin to 
   OE hweofan to turn - more at WHARF : to fly, revolve, or move rapidly with 
   a whir  : to move or carry rapidly with a whir 
2. whir also whirr n : a continuous fluttering or vibratory sound made by 
   something in rapid mo tion