medfly US/ˈmɛdfli/ uncommon noun 1. small black-and-white fly that damages citrus and other fruits by implanting eggs that hatch inside the fruit SynonymsMediterranean fruit flyCeratitis capitata Related words Broader terms fruit fly Parts Ceratitis WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.