Wiktionary
ugli fruit
n. A cross between a tangerine and grapefruit, grown in the West Indies
WordNet
ugli fruit
n. hybrid between grapefruit and mandarin orange; cultivated especially in Florida [syn: tangelo, tangelo tree, Citrus tangelo]
large sweet juicy hybrid between tangerine and grapefruit having a thick wrinkled skin [syn: tangelo, ugli]
Wikipedia
Ugli fruit
The ugli or ugli fruit is a Jamaican form of tangelo, a citrus fruit created by hybridizing a grapefruit (or pomelo), an orange, and a tangerine.
Its species is Citrus reticulata × Citrus paradisi.