duckbill Syllabification: (duck·bill)Pronunciation: /ˈdəkˌbil/Definition of duckbill noun an animal with jaws resembling a duck’s bill, e.g., a platypus or a duck-billed dinosaur. adjective [attributive] shaped like a duck’s bill:duckbill pliersduckbill in other Oxford dictionaries Definition of duckbill in the British & World English dictionary