tocoPronunciation: /ˈtəʊkə/ (also toco toucan)Definition of toco noun (plural tocos) the largest and most familiar South American toucan, with mainly black plumage, a white throat and breast, and a massive black-tipped orange bill. Ramphastos toco, family Ramphastidae Origin: late 18th century: via Portuguese from Tupi; compare with toucantoco in other Oxford dictionaries Definition of toco in the US English dictionary