"blackthorns" in the noun sense
1. blackthorn, sloe, Prunus spinosa
a thorny Eurasian bush with plumlike fruits
2. blackthorn, pear haw, pear hawthorn, Crataegus calpodendron, Crataegus tomentosa
erect and almost thornless American hawthorn with somewhat pear-shaped berries
Source: WordNet® (An amazing lexical database of English)
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