noun Download 🔗Share A large flightless bird of the genus Casuarius that is native to Australia and New Guinea, has a characteristic bony crest on its head, and can be very dangerous. Examples : "The zookeeper warned us to keep our distance from the cassowary enclosure because the large, flightless bird with the bony crest can be very aggressive. " bird animal nature biology Chat with AIVocabulary GamePractice Reading