Definition of poisonberry

  1. :  any of several plants with small inedible or poisonous fruits: such as a :  a shrub of the genus Cestrum b :  a West Indian shrub (Bourreria succulenta) of the family Boraginaceae with small flowers in corymbose cymes c :  poisonberry tree d :  bittersweet 2 a

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a rounded knoll or a ridge of ice

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