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|Noun||1.||genus Sinornis - a genus of fossil birds|
bird genus - a genus of birds
Archaeornithes, subclass Archaeornithes - primitive reptile-like fossil birds of the Jurassic or early Cretaceous
Sinornis - sparrow-sized fossil bird of the Jurassic period to the Cretaceous period having a keeled breastbone and vestigial tail; found in China; considered possibly the second most primitive of all birds
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