Definition of grapefruit
1
plural grapefruit or grapefruits
: a large round citrus fruit with a bitter yellow rind and a juicy somewhat tart pale yellow, pink, or reddish pulp
2
: a small citrus tree (Citrus paradisi) that produces grapefruit
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Merriam-Webster unabridged
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Time Traveler for grapefruit
The first known use of grapefruit was in 1814
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