1. cygnine - Noun
2. cygnine - Adjective
(zoology) Being of the genus Cygnus (swan), within subfamily Anserinae of the family Anatidae, though sometimes considered a distinct subfamily, Cygninae.
Of, concerning, pertaining to, resembling, or having the characteristics of a swan or swans.
cygnine (uncountable)
(dated) An alkaloid from plants of genus Gastrolobium, found in Australia, principally Western Australia, highly toxic to introduced animals.