iiwiPronunciation: /ɪˈiːwi/Definition of iiwi noun (plural same or iiwis) a Hawaiian honeycreeper with a long downcurved 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 US English dictionary