Noun horse chestnut has 2 senses
  1. horse chestnut, buckeye, Aesculus hippocastanum - tree having palmate leaves and large clusters of white to red flowers followed by brown shiny inedible seeds
    --1 is a kind of angiospermous tree, flowering tree
    --1 is a member of Aesculus, genus Aesculus
    --1 has particulars:
     sweet buckeye; Ohio buckeye; dwarf buckeye, bottlebrush buckeye; red buckeye; particolored buckeye
  2. buckeye, horse chestnut, conker - the inedible nutlike seed of the horse chestnut
    --2 is a kind of seed
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