an Australian swan, Cygnus atratus, having mostly black plumage and a red bill.
an occurrence or phenomenon that comes as a surprise because it was not predicted or was hard to predict (often used attributively):
a disastrous black-swan event that only appeared obvious in hindsight.
a large Australian swan, Cygnus atratus, that has a black plumage and red bill
a phenomenon that occurs even though it had been thought to be impossible


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