noun (n)

• nut of any of various walnut trees having a wrinkled two-lobed seed with a hard shell(noun.food)

  source: wordnet30
• hard dark-brown wood of any of various walnut trees; used especially for furniture and paneling(noun.plant)

  source: wordnet30
• any of various trees of the genus Juglans(noun.plant)

  Synonym:
  walnut tree
  

  source: wordnet30
• The fruit or nut of any tree of the genus Juglans; also, the tree, and its timber. The seven or eight known species are all natives of the north temperate zone.(noun)

  source: webster1913