most primitive avian type known; extinct bird of the Triassic having bird-like jaw and hollow limbs and breastbone with dinosaur-like tail and hind limbs
genus Protoavis 1
noundomain: animal
Princeton WordNet [ver.3.1]
English
Definition
extinct primitive birds of the Triassic period; 70 million years before archaeopteryx
most primitive avian type known; extinct bird of the Triassic having bird-like jaw and hollow limbs and breastbone with dinosaur-like tail and hind limbs