2. (noun)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 Synonyms: cockleburr, greatburdock, cocklebur, cockle-burr, greater burdock, cockle-bur