| 单词 | protoavis |
| 释义 | protoavis /proh'toh ay"vis/, n. 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. [ < NL (1986), equiv. to Gk proto- PROTO- + L avis bird] |
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