Burr

1. n. The round knob of an antler next to a deer’s head.
2. n. 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. Also, any weed which bears burs.
3. n. The thin ridge left by a tool in cutting or shaping metal. See Burr, n., 2.
4. n. A ring of iron on a lance or spear. See Burr, n., 4.
5. n. The lobe of the ear. See Burr, n., 5.
6. n. The sweetbread.
7. n. A clinker; a partially vitrified brick.
8. n. A small circular saw.
9. n. A triangular chisel.
10. n. A drill with a serrated head larger than the shank; — used by dentists.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.