- any of several usually brightly colored, fruit-eating birds of the family Ramphastidae, of tropical America, having a very large bill.
- (initial capital letter) Astronomy. the constellation Tucana.
- any tropical American arboreal fruit-eating bird of the family Ramphastidae, having a large brightly coloured bill with serrated edges and a bright plumage
bright-colored bird of S.America, 1560s, from French toucan (1550s) and Spanish tucan; from Tupi (Brazil) tuka, tukana, probably imitative of its call.