a shrub or small tree, Frangula alnus, of Eurasia and northern Africa, having nonedible red fruit that turns black when ripe.
Origin of alder buckthorn
First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for alder buckthorn
a Eurasian rhamnaceous shrub, Frangula alnus, with small greenish flowers and black berry-like fruits
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012