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• 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. • The thin ridge left by a tool in cutting or shaping metal. See Burr, n., 2. • A ring of iron on a lance or spear. See Burr, n., 4. • The lobe of the ear.