Source : Webster's Revised Unabridged Dictionary (1913)

Whir \Whir\, v. i. [imp. & p. p. {Whirred}; p. pr. & vb. n.
   {Whirring}.] [Perhaps of imitative origin; cf. D. hvirre to
   whirl, and E. hurr, hurry, whirl. ???.]
   To whirl round, or revolve, with a whizzing noise; to fly or
   more quickly with a buzzing or whizzing sound; to whiz.

         The partridge bursts away on whirring wings. --Beattie.

Source : WordNet®

whirring
     See {whir}

whir
     n : sound of something in rapid motion; "whir of a bird's
         wings"; "the whir of the propellers" [syn: {whirr}, {whirring},
          {birr}]
     [also: {whirring}, {whirred}]

whirring
     adj : like the sound of rapidly vibrating wings
     n : sound of something in rapid motion; "whir of a bird's
         wings"; "the whir of the propellers" [syn: {whir}, {whirr},
          {birr}]

whir
     v : make a soft swishing sound; "the motor whirred"; "the car
         engine purred" [syn: {whizz}, {whiz}, {whirr}, {birr}, {purr}]
     [also: {whirring}, {whirred}]