'Whirring' definitions:

Definition of 'whirring'

adjective

Like the sound of rapidly vibrating wings

noun

Sound of something in rapid motion; "whir of a bird's wings"; "the whir of the propellers" [syn: whir, whirr, whirring, birr]

From: GCIDE

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. [1913 Webster]
The partridge bursts away on whirring wings. --Beattie. [1913 Webster]