Definitions
1.AdjectiveBeing of the genus Cygnus (swans), within subfamily Anserinae of the family Anatidae, though sometimes considered a distinct subfamily, Cygninae.
2.AdjectiveOf, concerning, relating to, resembling, or characteristic of swans.
3.NounAn alkaloid from plants of genus Gastrolobium, found in Australia, principally Western Australia, highly toxic to introduced animals.