from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An Australian swan whose feathers are black.
- n. An occurrence believed impossible or not to exist.
- n. An occurrence believed impossible or not to exist, subsequently shown to exist.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. large Australian swan having black plumage and a red bill
Sorry, no etymologies found.
“Wallabah”; of black swan he observed hundreds, as well as ducks, “a small but excellent kind,” which flew in thousands, and “an abundance of most kinds of wild fowl.”
In 1697, a Dutch sea captain chanced upon a black swan in Australia, at which point the null hypothesis was proven true and the white swan theory had to be discarded.