"buckthorns" in the noun sense
1. buckthorn
a shrub or shrubby tree of the genus Rhamnus fruits are source of yellow dyes or pigments
2. buckthorn
any shrub or small tree of the genus Bumelia
3. English plantain, narrow-leaved plantain, ribgrass, ribwort, ripple-grass, buckthorn, Plantago lanceolata
an Old World plantain with long narrow ribbed leaves widely established in temperate regions
Source: WordNet® (An amazing lexical database of English)
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