—n.
1 a a whirring sound. b a rough sounding of the letter r.
2 (also bur) a a rough edge left on cut or punched metal or paper. b a surgeon's or dentist's small drill.
3 a a siliceous rock used for millstones. b a whetstone.
4 = BUR 1, 2.
5 the coronet of a deer's antler.
—v.
1 tr. pronounce with a burr.
2 intr. speak indistinctly.
3 intr. make a whirring sound.
Etymology: var. of BUR
Useful english dictionary. 2012.