[syn: blackthorn, pear haw, pear hawthorn, Crataegus calpodendron, Crataegus tomentosa]
The Collaborative International Dictionary of English v.0.48:
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 (Crat[ae]gus
tomentosa). Both are used for hedges.
WordNet (r) 3.0 (2006):
n 1: a thorny Eurasian bush with plumlike fruits [syn:
blackthorn, sloe, Prunus spinosa]
2: erect and almost thornless American hawthorn with somewhat
pear-shaped berries [syn: blackthorn, pear haw, pear
hawthorn, Crataegus calpodendron, Crataegus tomentosa]