| bur | (noun) small bit used in dentistry or surgery | Synonyms: burr |
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| (noun) seed vessel having hooks or prickles | Synonyms: burr |
| butterbur | (noun) small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas | Synonyms: bog rhubarb, Petasites hybridus, Petasites vulgaris |
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| clotbur | (noun) any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs | Synonyms: burdock |
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| cocklebur | (noun) any coarse weed of the genus Xanthium having spiny burrs | Synonyms: cockle-bur, cockle-burr, cockleburr |
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| (noun) burdock having heart-shaped leaves found in open woodland, hedgerows and rough grassland of Europe (except extreme N) and Asia Minor; sometimes cultivated for medicinal and culinary use | Synonyms: Arctium lappa, great burdock, greater burdock |
| sambur | (noun) a deer of southern Asia with antlers that have three tines | Synonyms: Cervus unicolor, sambar |
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| sandbur | (noun) grass of the eastern United States and tropical America having spikelets enclosed in prickly burs | Synonyms: Cenchrus tribuloides, field sandbur, sandspur |
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