black·thorn /ˈblækˌθɔrn/
 李樹的一種,李木手杖


 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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 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]