Definition of horse chestnut noun from the Oxford Advanced Learner's Dictionary

     

    horse chestnut

     noun
    noun
    BrE
     
    ; NAmE
     
    Plants
     
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  1. 1 a large tall tree with spreading branches, white or pink flowers and nuts that grow inside cases which are covered with spikes see also chestnut See related entries: Plants
  2. 2 the smooth brown nut of the horse chestnut tree compare conker
  3. Word Origin late 16th cent.: translating (now obsolete) botanical Latin Castanea equina; its fruit is said to have been an Eastern remedy for chest diseases in horses.
See the Oxford Advanced American Dictionary entry: horse chestnut