noun (n)

• yellow oval fruit with juicy acidic flesh(noun.food)

  source: wordnet30
• a strong yellow color(noun.attribute)

  Synonym:
  gamboge, lemon yellow, maize
  

  source: wordnet30
• a small evergreen tree that originated in Asia but is widely cultivated for its fruit(noun.plant)

  Synonym:
  citrus limon, lemon tree
  

  source: wordnet30
• a distinctive tart flavor characteristic of lemons(noun.cognition)

  source: wordnet30
• an artifact (especially an automobile) that is defective or unsatisfactory(noun.artifact)

  Synonym:
  stinker
  

  source: wordnet30
• An oval or roundish fruit resembling the orange, and containing a pulp usually intensely acid. It is produced by a tropical tree of the genus Citrus, the common fruit known in commerce being that of the species C. Limonum or C. Medica (var. Limonum). There are many varieties of the fruit, some of which are sweet.(noun)

  source: webster1913