"grapefruit-like fruit," 1858, of uncertain origin; apparently related to Latin pomum "fruit; apple" (see Pomona).
Entries linking to pomelo
Pomona n.
Roman goddess of fruit trees and their culture, from Latin pomum "apple; fruit," a word of uncertain origin. "Possibly from *po-emo- 'taken off, picked'; *po-omo- or *pe-omo- are also conceivable" [de Vaan]. Or perhaps borrowed from a lost Mediterranean language. Related: Pomonical.
tangelo n.
"hybrid of a tangerine and a pomelo," 1904, the word formed like the fruit.