Hypertext Webster Gateway: "blackthorn"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Blackthorn \Black"thorn`\, n. (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 {Crat[ae]gus} or hawthorn ({C.
tomentosa}). Both are used for hedges.
From WordNet (r) 1.7 (wn)
blackthorn
n 1: a thorny Eurasian bush with plumlike fruits [syn: {sloe}, {Prunus
spinosa}]
2: erect and almost thornless American hawthorn with somewhat
pear-shaped berries [syn: {pear haw}, {pear hawthorn}, {Crataegus
calpodendron}, {Crataegus tomentosa}]
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