n. A prickly seed vessel. See bur, 1.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.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.n. A broad iron ring on a tilting lance just below the gripe, to prevent the hand from slipping.n. The lobe or lap of the ear.n. A guttural pronounciation 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 burr, Northumberland burr, or Tweedside burr.n. The knot at the bottom of an antler. See Bur, n., 8.verb-intransitive. To speak with burr; to make a hoarse or guttural murmur.