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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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Definitions of burr from WordNet
1
burr (n.)
seed vessel having hooks or prickles;
Synonyms: bur
burr (n.)
rough projection left on a workpiece after drilling or cutting;
burr (n.)
rotary file for smoothing rough edges left on a workpiece;
burr (n.)
small bit used in dentistry or surgery;
Synonyms: bur
2
burr (v.)
remove the burrs from;
Synonyms: bur
3
Burr (n.)
United States politician who served as vice president under Jefferson; he mortally wounded his political rival Alexander Hamilton in a duel and fled south (1756-1836);
Synonyms: Aaron Burr
From wordnet.princeton.edu