Main Entry: buck·thorn

Pronunciation: \-ˌthȯrn\

Function: noun

Date: 1578

1 : any of a genus (Rhamnus of the family Rhamnaceae, the buckthorn family) of often thorny trees or shrubs some of which yield purgatives or pigments
2 : a shrub or small tree (Bumelia lycioides) of the sapodilla family of the southern United States