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|Noun||1.||genus Rhamnus - type genus of the Rhamnaceae: buckthorns|
dicot genus, magnoliopsid genus - genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination
buckthorn family, family Rhamnaceae, Rhamnaceae - trees and shrubs usually thorny bearing drupaceous fruit many having medicinal value
buckthorn - a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments