1a whirring sound, such as a telephone ringing tone or the sound of cogs turning.
a rough pronunciation of the letter r, especially with a uvular trill as in a Northumberland accent.
(loosely) a regional accent:a soft Scottish burr
2 (also bur) a rough edge or ridge left on an object (especially of metal) by the action of a tool or machine.
3 (also bur) a small rotary cutting tool with a shaped end, used chiefly in woodworking and dentistry.
a small surgical drill for making holes in bone, especially in the skull.
4 [mass noun] a siliceous rock used for millstones.
[count noun] a whetstone.
5 (also bur) a prickly seed case or flower head that clings to clothing and animal fur.
[usually as modifier] a plant that produces burrs, for example bur-reed.
6 (also bur) [as modifier] denoting wood containing knots or other growths which show a pattern of dense swirls in the grain when sawn, used for veneers and other decorative woodwork:burr walnut
7the coronet of a deer’s antler.
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Universal
1 [no object] make a whirring sound.
speak with a regional accent, especially one in which the letter r is prominent.
2 [with object] form a rough edge on (metal).
a burr under someone's saddle
North American informal a persistent source of irritation.
