The Collaborative International Dictionary
Citrus paradisi
grapefruit \grape"fruit`\ (gr[=a]p"fr[=oo]t`), n.
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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.
The large yellow fruit of the Citrus paradisi, having somewhat acid juicy pulp. It is a popular breakfast food.