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black swan noun

  /blæk ˈswɑn/ , /blæk ˈswɒn/
  • Cygnus atratus, a swan with black plumage and a red bill which is endemic to Australia. [from c. 1700]
  • Something believed impossible or not to exist, especially if an example is subsequently found; also, something extremely rare; a rara avis.
 cygne noir
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