Definition of horse chestnut noun from the Oxford Advanced American Dictionary

     

    horse chestnut

     noun
    noun
     
     
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  1. 1a large, tall tree with spreading branches, white, or pink flowers and nuts that grow inside cases which are covered with spikes see also chestnut
  2. 2 the smooth brown nut of the horse chestnut tree
See the Oxford Advanced Learner's Dictionary entry: horse chestnut