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burr1

[bur]
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noun
  1. Also buhr. a protruding, ragged edge raised on the surface of metal during drilling, shearing, punching, or engraving.
  2. a rough or irregular protuberance on any object, as on a tree.
  3. a small, handheld, power-driven milling cutter, used by machinists and die makers for deepening, widening, or undercutting small recesses.
  4. a lump of brick fused or warped in firing.
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verb (used with object)
  1. to form a rough point or edge on.
  2. deburr.
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Also bur (for defs 1, 3).

Origin of burr1

First recorded in 1605–15; spelling variant of bur1

burr2

or bur

[bur]
noun
  1. a washer placed at the head of a rivet.
  2. a blank punched out of a piece of sheet metal.
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Origin of burr2

1375–1425; late Middle English burrewez (plural), buruhe circle, variant of brough round tower; see broch

burr3

[bur]
noun
  1. a pronunciation of the r-sound as a uvular trill, as in certain Northern English dialects.
  2. a pronunciation of the r-sound as an alveolar flap or trill, as in Scottish English.
  3. any pronunciation popularly considered rough or nonurban.
  4. a whirring noise.
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verb (used without object)
  1. to speak with a burr.
  2. to speak roughly, indistinctly, or inarticulately.
  3. to make a whirring sound.
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verb (used with object)
  1. to pronounce (words, sounds, etc.) with a burr.
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Origin of burr3

First recorded in 1750–60; apparently both imitative and associative, the sound being thought of as rough like a bur

burr4

or buhr

[bur]
noun
  1. burstone.
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Origin of burr4

1250–1300; Middle English burre, probably so called from its roughness

Burr

[bur]
noun
  1. Aaron,1756–1836, vice president of the U.S. 1801–05.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for burr

burr1

noun
  1. a small power-driven hand-operated rotary file, esp for removing burrs or for machining recesses
  2. a rough edge left on a workpiece after cutting, drilling, etc
  3. a rough or irregular protuberance, such as a burl on a tree
  4. British a burl on the trunk or root of a tree, sliced across for use as decorative veneer
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noun, verb
  1. a variant spelling of bur
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verb (tr)
  1. to form a rough edge on (a workpiece)
  2. to remove burrs from (a workpiece) by grinding, filing, etc; deburr
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Word Origin

C14: variant of bur

burr2

noun
  1. 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
  2. a whirring sound
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verb
  1. to pronounce (words) with a burr
  2. to make a whirring sound
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Word Origin

C18: either special use of bur (in the sense: rough sound) or of imitative origin

burr3

bur

noun
  1. a washer fitting around the end of a rivet
  2. a blank punched out of sheet metal
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Word Origin

C16 (in the sense: broad ring on a spear): variant of burrow (in obsolete sense: borough)

burr4

buhr or bur

noun
  1. short for buhrstone
  2. a mass of hard siliceous rock surrounded by softer rock
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Word Origin

C18: probably from bur, from its qualities of roughness

Burr

noun
  1. 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
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for burr

n.

"rough sound of the letter -r-" (especially that common in Northumberland), 1760, later extended to "northern accented speech" in general. Possibly the sound of the word is imitative of the speech peculiarity itself, or it was adapted from one of the senses of bur (q.v.), perhaps from the phrase to have a bur in (one's) throat (late 14c.), which was a figure of speech for "feel a choking sensation, huskiness." OED says the Scottish -r- is a lingual trill, not a true burr.

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Online Etymology Dictionary, © 2010 Douglas Harper

burr in Medicine

burr

(bûr)
n.
  1. Variant ofbur

burr in Science

bur