ibisbill Syllabification: (i·bis·bill)Pronunciation: /ˈībisˌbil/Definition of ibisbill noun an upland wading bird of central Asia, with a long, down-curved bill and black, white, and blue-gray plumage on the head and breast. Ibidorhyncha struthersii, the only member of the family Ibidorhynchidae ibisbill in other Oxford dictionaries Definition of ibisbill in the British & World English dictionary