noun
or cock·le·burr ˈkäkəl, ˈkəkəl+ˌ-
( -s )
Etymology: cockle (I) + bur
1. : a plant of the genus Xanthium
2. : the prickly fruit of a cocklebur that readily attaches itself to any passing object by means of the stiff hooked spines with which it is clothed