black swan

English

An Australian black swan

Etymology

A calque, equivalent to black + swan. Roman satirist Juvenal wrote in AD 82 of rara avis in terris nigroque simillima cygno ("a rare bird in the lands, and very like a black swan"), creating a durable metaphor and expression.

Noun

black swan (plural black swans)

  1. Cygnus atratus, an Australian swan whose feathers are black. [c. 1700]
  2. Something believed impossible or not to exist, of which an example is subsequently found.

Quotations

  • For quotations of use of this term, see Citations:black swan.

Synonyms

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References

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