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one word, wikipedia. It wouldn't lie to you
Most botanists agree that the grapefruit is a cross between a Pummelo and a sweet orange
Grapefruit, like all citrus fruit, is a Hesperidum, or a large modified berry with a thick rind.If you see grapefruit growing on a tree, you will notice that they grow in clusters. It is suggested that these clusters resemble the shape of large yellow grapes and so the fruit was called a grapefruit. Another explanation is that the premature grapefruit looks similar in shape to unripe green grapes.