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Webster 1913 Edition

Blackthorn

Black′thornˊ

,
Noun.
(Bot.)
(a)
A spreading thorny shrub or small tree (
Prunus spinosa
), with blackish bark, and bearing little black plums, which are called sloes; the sloe.
(b)
A species of
Cratægus
or hawthorn (
Cratægus tomentosa
). Both are used for hedges.

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