whitethorn
  山楂
  White·thorn n. Bot. The hawthorn.
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  whitethorn
       n : thorny Eurasian shrub of small tree having dense clusters of
           white to scarlet flowers followed by deep red berries;
           established as an escape in eastern North America [syn: English
           hawthorn, may, Crataegus laevigata, Crataegus
           oxycantha]