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2 definitions found
 for Bur
From The Collaborative International Dictionary of English v.0.48 :

  Bur \Bur\, Burr \Burr\ (b[^u]r), n. [OE. burre burdock; cf. Dan.
     borre, OSw. borra, burdock, thistle; perh. akin to E. bristle
     (burr- for burz-), or perh. to F. bourre hair, wool, stuff;
     also, according to Cotgrave, "the downe, or hairie coat,
     wherewith divers herbes, fruits, and flowers, are covered,"
     fr. L. burrae trifles, LL. reburrus rough.]
     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.
        [1913 Webster]
  
              Amongst rude burs and thistles.       --Milton.
        [1913 Webster]
  
              Bur and brake and brier.              --Tennyson.
        [1913 Webster]
  
     2. The thin ridge left by a tool in cutting or shaping metal.
        See Burr, n., 2.
        [1913 Webster]
  
     3. A ring of iron on a lance or spear. See Burr, n., 4.
        [1913 Webster]
  
     4. The lobe of the ear. See Burr, n., 5.
        [1913 Webster]
  
     5. The sweetbread.
        [1913 Webster]
  
     6. A clinker; a partially vitrified brick.
        [1913 Webster]
  
     7. (Mech.)
        (a) A small circular saw.
        (b) A triangular chisel.
        (c) A drill with a serrated head larger than the shank; --
            especially a small drill bit used by dentists.
            [1913 Webster]
  
     8. [Cf. Gael. borr, borra, a knob, bunch.] (Zool.) The round
        knob of an antler next to a deer's head. [Commonly written
        burr.]
        [1913 Webster]
  
     Bur oak (Bot.), a useful and ornamental species of oak
        ({Quercus macrocarpa) with ovoid acorns inclosed in deep
        cups imbricated with pointed scales. It grows in the
        Middle and Western United States, and its wood is tough,
        close-grained, and durable.
  
     Bur reed (Bot.), a plant of the genus Sparganium, having
        long ribbonlike leaves.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  bur
      n 1: seed vessel having hooks or prickles [syn: bur, burr]
      2: small bit used in dentistry or surgery [syn: bur, burr]
      v 1: remove the burrs from [syn: bur, burr]

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