Noun black walnut has 2 senses
  1. black walnut, black walnut tree, black hickory, Juglans nigra - North American walnut tree with hard dark wood and edible nut
    --1 is a kind of walnut, walnut tree
    --1 is a member of Juglans, genus Juglans
    --1 has parts: black walnut
  2. black walnut - American walnut having a very hard and thick woody shell
    --2 is a kind of
    walnut
    --2 is a part of black walnut, black walnut tree, black hickory, Juglans nigra
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