- cocklebur, cockle-bur, cockleburr, cockle-burr - any coarse weed of the genus Xanthium having spiny burrs
--1 is a kind of weed
--1 is a member of Xanthium, genus Xanthium - great burdock, greater burdock, cocklebur, Arctium lappa - 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
--2 is a kind of burdock, clotbur