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Määritelmät

Substantiivit

1. Cygnus atratus, a swan with black plumage and a red bill which is endemic to Australia.
2. (figurative)
3. Something believed impossible or not to exist, especially if an example is subsequently found; also, something extremely rare; a rara avis.
4. (specifically, also, attributive) A rare and hard-to-predict event with major consequences.