Webster's English Dictionary

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burr

1. burr or bur \'b*r\ \'b*rd\ \'b*r-*r\ n or bur [ME burre; akin to OE 
   byrst bristle - more at BRISTLE] [ME burwhe circle] usu  1a: a rough or 
   prickly envelope of a fruit  1b: a weed that bears burs  2a: something that 
   resembles a bur  2b1: a small rotary cutting tool  usu  2b2: a bit used on 
   a dental drill  3: a small washer put on the end of a rivet before swaging 
   it down  4: an irregular rounded mass; : esp. a tree burl  5: a thin ridge 
   or area of roughness produced in cutting or shaping  6a: a trilled uvular r 
   as used by some speakers of English esp. in no rthern England and in 
   Scotland 6b: a tongue-point trill that is the usual Scottish r  7: a rough 
   humming sound : whir  - burred aj
2. burr vi 1: to speak with a burr  2: to make a whirring sound  1: to 
   pronounce with a burr  2a: to form into a projecting edge  2b: to remove 
   burrs from 
3. burr n [perh. fr. 1burr] : BUHRSTONE