n. | 1. | (Bot.) Any rough or prickly envelope of the seeds of plants, whether a pericarp, a persistent calyx, or an involucre, as of the chestnut and burdock; a seed vessel having hooks or prickles. Also, any weed which bears burs. |
| 2. | The thin ridge left by a tool in cutting or shaping metal. See Burr, n., 2. |
| 3. | A ring of iron on a lance or spear. See Burr, n., 4. |
| 4. | The lobe of the ear. See Burr, n., 5. |
| 5. | The sweetbread. |
| 6. | A clinker; a partially vitrified brick. |
| 7. | (Mech.) A small circular saw. |
| 8. | (Zool.) The round knob of an antler next to a deer's head. |