iiwi Syllabification: (i·i·wi)Pronunciation: /ēˈēˌwē/Definition of iiwi noun (plural same or iiwis) a Hawaiian honeycreeper with a long, down-curved bill and mainly bright red plumage. Vestiaria coccinea, family Drepanididae (or Fringillidae) Origin: late 18th century: from Hawaiianiiwi in other Oxford dictionaries Definition of iiwi in the British & World English dictionary