xanthium

Xanthium

Xan"thi*um\, n. [NL., fr. Gr. xa`nqion a plant used for dyeing the hair yellow, said to be the Xanthium strumarium, from xanqo`s yellow.] (Bot.) A genus of composite plants in which the scales of the involucre are united so as to form a kind of bur; cocklebur; clotbur.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
xanthium

noun
coarse herbs having small heads of greenish flowers followed by burrs with hooked bristles 
WordNet® 3.0, © 2006 by Princeton University.
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