Buckthorn - Definition
buckthorn
n 1: a shrub or shrubby tree of the genus Rhamnus; fruits are
source of yellow dyes or pigments
2: any shrub or small tree of the genus Bumelia
3: an Old World plantain with long narrow ribbed leaves widely
established in temperate regions [syn: English plantain,
narrow-leaved plantain, ribgrass, ribwort, ripple-
grass, buckthorn, Plantago lanceolata]