n. The rough, prickly case or covering of the seeds of certain plants, as of the chestnut and burdock.n. Hence The plant burdock: as, “rude burs and thistles,”n. In general, a protuberance upon, or a raised portion of, an object, usually more or less rough or irregular in form.n. The name of various tools and appliances.n. A partially vitrified brick; a clinker. Also called bur-brick.n. The blank driven out of a piece of sheet-metal by a punch.n. Waste raw silk.n. A name for the club-moss, Lycopodium clavatum.n. The sweetbread.n. Same as burl, 2.n. Same as burstone.n. The rounded knob forming the base of a deer's horn.n. The external meatus of the ear; the opening leading to the tympanum.n. The guttural pronunciation of the rough r common in some of the northern counties of England, especially Northumberland; rhotacism.n. A whirring noise. See birr, n.To speak with a guttural or rough pronunciation of the letter r.To talk or whisper hoarsely; murmur.To make a whirring noise. See birr, verbn. Same as burrow, 3.n. A halo round the moon. Compare burrow, 4, brough, 4.n. An abnormal outgrowth of wood, frequently of large size, occurring on the trunk or branch of a tree, usually as the result of some injury. See burl, 2.To extract (burs and other extraneous matter) from (wool) by chemical or mechanical means.To use a dental bur in the excavation of (a tooth-cavity).n. The native Indian name for the banian-tree.