noun (n)

• widely cultivated plant having a large fleshy edible white or yellow root(noun.plant)

  Synonym:
  brassica rapa, white turnip
  

  source: wordnet30
• root of any of several members of the mustard family(noun.food)

  source: wordnet30
• The edible, fleshy, roundish, or somewhat conical, root of a cruciferous plant (Brassica campestris, var. Napus); also, the plant itself.(noun)

  source: webster1913