Most primitive avian type known

• Extinct bird of the Triassic having birdlike jaw and hollow limbs and breastbone with dinosaur-like tail and hind limbs

WordNet Word definitions in WordNet
n. most primitive avian type known; extinct bird of the Triassic having birdlike jaw and hollow limbs and breastbone with dinosaur-like tail and hind limbs

Wikipedia Word definitions in Wikipedia
Protoavis (meaning "first bird") is a problematic taxon of archosaurian known from fragmentary remains from Late Triassic Norian stage deposits near Post, Texas . Much controversy remains over the animal, and there are many different interpretations of ...