SYN: Rhamnus.
* * *
buck·thorn 'bək-.thȯ(ə)rn n a shrub or tree of the genus Rhamnus sometimes having thorny branches and often containing purgative principles in bark or sap and producing fruits sometimes used as a source of yellow and green dyes or pigments see CASCARA BUCKTHORN
* * *
buck·thorn (bukґthorn) 1. any of various trees and shrubs of the genus Rhamnus. 2. Karwinskia humboldtiana. See also under poisoning.Medical dictionary. 2011.