protoavis

/proh-toh-ey-vis/US // ˌproʊ toʊˈeɪ vɪs //

原生代,原子星

Definitions

n.名词 noun

1
- : a fossil bird of the genus Protoavis, from the Triassic Period, having a birdlike, partly toothless jaw structure, a tail and hind legs resembling those of the dinosaur, and the hollow bones and keellike breast that are characteristic of modern birds: the oldest known avian type, preceding the archaeopteryx by an estimated 75 million years.