yellow-billedEnglishOxford New American Dictionaryyellow-billed /ˌyelōˈbild, ˌjɛloʊˈbɪld / ▸ adjective (of a bird) having a yellow bill. Used in the name of numerous such birds, including. ● the North American yellow-billed cuckoo (Coccyzus americanus, family Cuculidae). ● the African yellow-billed duck (Anas undulata, family Anatidae).