One of the mysteries of the English language finally explained.
A genus of parrots native to South and Central America, with variably coloured plumage in which the feathers under the tail coverts are red; (also pionus) a parrot of this genus, often kept as a pet.
Late 19th century; earliest use found in Alfred Wallace (1823–1913), naturalist, evolutionary theorist, and social critic. From scientific Latin Pionus, genus name; further etymology unknown.
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