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countable and uncountable, plural grapefruits or grapefruit
The tree of the species Citrus paradisi, a hybrid of pomelo (Citrus maxima) and sweet orange. quotations examples
Results have begun to come in and at Comfort Castle this month I spent a useful and happy half day carting round 8 children in my car to their homes where we all helped to fill in with good soil and manure, their excellently dug holes and planted the grapefruit.
1932, The Farmer, page 64
The large spherical tart fruit produced by this tree. quotations examples
Grapefruit is high in vitamin C. The pink and red varieties contain vitamin A (betacarotene) and lycopene, an antioxidant that may help prevent cancer. Grapefruit contains a chemical that can alter intestinal absorption of some medications and lead to higher than normal blood levels of some drugs and potential problems.
2002, “Fruits”, in Encyclopedia of Foods: A Guide to Healthy Nutrition, Academic Press, part II (Encyclopedia of Foods), page 176, column 3
Once loaded by Canaveral, the grapefruit are transported to Japan, where the shipments are unloaded by employees of Japanese stevedoring companies. The grapefruit are then received by the Japanese importers.
2002, NLRB Advice Memorandum Reporter, Labor Relations Press, page 100