From The Collaborative International Dictionary of English v.0.48:

grapefruit \grape"fruit`\ (gr[=a]p"fr[=oo]t`), n.
   1. A citrus tree (Citrus paradisi) bearing large round
      edible fruit having a thick yellow rind and juicy somewhat
      acid pulp. [WordNet sense 1]

   Syn: Citrus paradisi.
        [WordNet 1.5]

   2. The large yellow fruit of the Citrus paradisi, having
      somewhat acid juicy pulp. It is a popular breakfast food.
      [WordNet sense 2]
      [WordNet 1.5 +PJC]
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