<p><strong>Noun</strong></p><ul><li>A rough, prickly case around the seeds of certain plants, as the chestnut or burdock.</li><li>Any bur-bearing plant.</li><li>Something that adheres like a bur.</li><li>Machinery: burr 1 (defs 1, 3).</li><li>Dentistry: a rotary cutting tool usually of steel or other hard metal shaped into a shank and a head, for removing carious material from teeth and preparing cavities for filling.</li><li>Surgery: a cutting tool resembling that of a dentist, used for the excavation of bone.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) burred, bur·ring: to extract or remove burs from.</li></ul><p><strong>End of Response</strong></p>