Sloe n.  Bot. A small, bitter, wild European plum, the fruit of the blackthorn (Prunus spinosa); also, the tree itself.
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  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 Cratægus or hawthorn (Cratægus tomentosa).  Both are used for hedges.
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  Prunus spinosa
       n : a thorny Eurasian bush with plumlike fruits [syn: blackthorn,
            sloe]