What is "clotbur"

Cocklebur \Coc"kle*bur`\, n. (Bot.) A coarse, composite weed, having a rough or prickly fruit; one of several species of the genus Xanthium; -- called also clotbur.

n. 1 (context UK dialect English) The burdock. 2 The cocklebur.

n. any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs [syn: burdock]