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1. (Animals) a large Australian swan, Cygnus atratus, that has a black plumage and red bill
2. a phenomenon that occurs even though it had been thought to be impossible
[sense 2 from the fact all swans were thought to be white until black swans were discovered in Australia]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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|Noun||1.||black swan - large Australian swan having black plumage and a red bill|
swan - stately heavy-bodied aquatic bird with very long neck and usually white plumage as adult
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