\Whur\, v. i. [Probably of imitative origin. Cf. {Hurr},
{Hurry}, {Whir}.]
1. To make a rough, humming sound, like one who pronounces
   the letter r with too much force; to whir; to birr.
2. To snarl or growl, as a dog. --Halliwell.

\Whur\, n.
A humming or whirring sound, like that of a body moving
through the air with velocity; a whir.