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Latin word avis comes from Proto-Indo-European *h₂ow-, and later Proto-Indo-European *h₂éwis (Bird.)
*h₂ow- (Proto-Indo-European)
*h₂éwis (Proto-Indo-European)
Bird.
*awis (Proto-Italic)
Bird.
avis (Latin)
(figuratively) omen, portent. A bird.