'Birr' definitions:

Definition of 'birr'

From: WordNet
noun
The basic unit of money in Ethiopia; equal to 100 cents
noun
Sound of something in rapid motion; "whir of a bird's wings"; "the whir of the propellers" [syn: whir, whirr, whirring, birr]
verb
Make a soft swishing sound; "the motor whirred"; "the car engine purred" [syn: whizz, whiz, whirr, whir, birr, purr]

Definition of 'Birr'

From: GCIDE
  • Birr \Birr\, v. i. [imp. & p. p. Birred; p. pr. & vb. n. Birring.] [Cf. OE. bur, bir, wind, storm wind, fr. Icel. byrr wind. Perh. imitative.] To make, or move with, a whirring noise, as of wheels in motion. [1913 Webster]

Definition of 'Birr'

From: GCIDE
  • Birr \Birr\, n.
  • 1. A whirring sound, as of a spinning wheel. [1913 Webster]
  • 2. A rush or impetus; force. [1913 Webster]