yellowbillEnglishOxford Dictionary of Englishyellowbill /ˈjɛləʊbɪl / ▸ noun any of a number of birds with yellow bills. ▪ the African yellow-billed duck (Anas undulata, family Anatidae). ▪ the African yellow-billed cuckoo (Ceuthmochares aereus, family Cuculidae).