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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]