noun, verb, burred, bur⋅ring.| 1. | a rough, prickly case around the seeds of certain plants, as the chestnut or burdock. |
| 2. | any bur-bearing plant. |
| 3. | something that adheres like a bur. |
| 4. | Machinery. burr 1 (defs. 1, 3). |
| 5. | Dentistry. a rotary cutting tool usually of steel or other hard metal shaped into a shank and a head, for removing carious material from teeth and preparing cavities for filling. |
| 6. | Surgery. a cutting tool resembling that of a dentist, used for the excavation of bone. |
| 7. | to extract or remove burs from. |

| 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, hand-held, 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. |
| 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. |
| 5. | to speak with a burr. |
| 6. | to speak roughly, indistinctly, or inarticulately. |
| 7. | to make a whirring sound. |
| 8. | to pronounce (words, sounds, etc.) with a burr. |

burr 1 (bûr) n.
[Variant of bur1.] |
bur or burr (bûr)
n.
A rotary cutting instrument used in dentistry for excavating decay, shaping cavity forms, and reducing tooth structure.
A drilling tool for enlarging a trephine hole in the cranium.
burr (bûr)
n.
Variant of bur.