Definitions for xanthium
Xanthium, genus Xanthium(noun)
coarse herbs having small heads of greenish flowers followed by burrs with hooked bristles
a genus of composite plants in which the scales of the involucre are united so as to form a kind of bur; cocklebur; clotbur
U.S. National Library of Medicine
A plant genus of the family ASTERACEAE. The name "prickly burweed" is sometimes used but causes confusion with AMSINCKIA.