Grapefruit is a popular name for the edible fruit of Citrus decumana, now widely used in the dietary of American households. Although the designation pomelo has been adopted in scientific circles in this country, and the fruit is termed “pomelow” by the English of Ceylon and India, the now familiar expression grapefruit, selected in recognition of the fact that the fruit commonly occurs on the trees in large clusters somewhat resembling those of grapes, is likely to be retained. The name “shaddock,” which was likewise employed by some a few decades ago, is all but abandoned now.