Burr

Also, buhr. a protruding, ragged edge raised on the surface of metal during drilling, shearing, punching, or engraving.
a rough or irregular protuberance on any object, as on a tree.
a small, hand-held, power-driven milling cutter, used by machinists and die makers for deepening, widening, or undercutting small recesses.
a lump of brick fused or warped in firing.
to form a rough point or edge on.
deburr.
a washer placed at the head of a rivet.
a blank punched out of a piece of sheet metal.
a pronunciation of the r- sound as a uvular trill, as in certain Northern English dialects.
a pronunciation of the r- sound as an alveolar flap or trill, as in Scottish English.
any pronunciation popularly considered rough or nonurban.
a whirring noise.
to speak with a burr.
to speak roughly, indistinctly, or inarticulately.
to make a whirring sound.
to pronounce (words, sounds, etc.) with a burr.
burstone.
Aaron, 1756–1836, vice president of the U.S. 1801–05.
Contemporary Examples

Obamaville Don Rose November 5, 2008
No, the 2nd Amendment Does Not Authorize Armed Sedition David Frum March 24, 2013
New York’s Most Tragic Ghost Loves Minimalist Swedish Fashion Nina Strochlic January 7, 2015
How Gay Was Gore Vidal? Tim Teeman July 30, 2013
A Tale of Two Vice Presidents Lawrence Wilkerson May 30, 2009

Historical Examples

The Life of John Marshall (Volume 2 of 4) Albert J. Beveridge
A Breath of Prairie and other stories Will Lillibridge
White Dandy; or, Master and I Velma Caldwell Melville
Howards End E. M. Forster
The Life of John Marshall Volume 3 of 4 Albert J. Beveridge

noun
a small power-driven hand-operated rotary file, esp for removing burrs or for machining recesses
a rough edge left on a workpiece after cutting, drilling, etc
a rough or irregular protuberance, such as a burl on a tree
(Brit) a burl on the trunk or root of a tree, sliced across for use as decorative veneer
noun, verb
a variant spelling of bur
verb (transitive)
to form a rough edge on (a workpiece)
to remove burrs from (a workpiece) by grinding, filing, etc; deburr
noun
(phonetics) an articulation of (r) characteristic of certain English dialects, esp the uvular fricative trill of Northumberland or the retroflex r of the West of England
a whirring sound
verb
to pronounce (words) with a burr
to make a whirring sound
noun
a washer fitting around the end of a rivet
a blank punched out of sheet metal
noun
short for buhrstone
a mass of hard siliceous rock surrounded by softer rock
noun
Aaron. 1756–1836, US vice-president (1800–04), who fled after killing a political rival in a duel and plotted to create an independent empire in the western US; acquitted (1807) of treason
n.
bur also burr
(bûr)
A type of pseudocarp in which the outer surface possesses hooks or barbs. Burs become caught in the feathers or hair of animals, which then carry them away to disperse the seeds.