WordNet (r) 3.0 (2006):

ugli fruit
    n 1: hybrid between grapefruit and mandarin orange; cultivated
         especially in Florida [syn: tangelo, tangelo tree,
         ugli fruit, Citrus tangelo]
    2: large sweet juicy hybrid between tangerine and grapefruit
       having a thick wrinkled skin [syn: tangelo, ugli, ugli
       fruit]