Ugli fruit Syllabification: (Ug·li fruit)Pronunciation: /ˈəglē/Definition of Ugli fruit noun (plural same) trademark a mottled green and yellow citrus fruit that is a hybrid of grapefruit and tangerine. This fruit is obtained from the tree Citrus × tangelo, family Rutaceae Origin: 1930s: ugli, alteration of uglyUgli fruit in other Oxford dictionaries Definition of Ugli fruit in the British & World English dictionary