1. (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.

2. (n.) The thin ridge left by a tool in cutting or shaping metal. See Burr.

3. (n.) A ring of iron on a lance or spear. See Burr.

4. (n.) The lobe of the ear. See Burr, n., 5.

5. (n.) The sweetbread.

6. (n.) A clinker; a partially vitrified brick.

7. (n.) A small circular saw.

8. (n.) A triangular chisel.

9. (n.) A drill with a serrated head larger than the shank; -- used by dentists.

10. (n.) The round knob of an antler next to a deer's head.

11. (n.) A prickly seed vessel. See Bur, 1.

12. (n.) The thin edge or ridge left by a tool in cutting or shaping metal, as in turning, engraving, pressing, etc.; also, the rough neck left on a bullet in casting.

13. (n.) A thin flat piece of metal, formed from a sheet by punching; a small washer put on the end of a rivet before it is swaged down.

14. (n.) A broad iron ring on a tilting lance just below the gripe, to prevent the hand from slipping.

15. (n.) The lobe or lap of the ear.

16. (n.) A guttural pronunciation of the letter r, produced by trilling the extremity of the soft palate against the back part of the tongue; rotacism; -- often called the Newcastle, Northumberland, or Tweedside, burr.

17. (n.) The knot at the bottom of an antler. See Bur, n., 8.

18. (v. i.) To speak with burr; to make a hoarse or guttural murmur.

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