(also archosaurus /ˌärkəˈsôrəs/)
nounZoology & Paleontology
A reptile of a large group that includes the dinosaurs and pterosaurs, represented today only by the crocodilians.
- Subdivision Archosauria, subclass Diapsida
More example sentences
- Other archosaurs included the pterosaurs, relatives of dinosaurs but not true dinosaurs.
- At the same time, the broad, dry plains of equatorial Pangea provided a proving ground for a strange new group of lightweight, but large-bodied, archosaurs - the dinosaurs.
- The archosaur skull includes two new fenestra (skull openings).
1930s: from modern Latin Archosauria, from Greek arkhos 'chief' or arkhōn 'ruler' + -saur.
- More example sentences
- The hot dry Pangean deserts of the Triassic would witness the competition between the synapsid proto-mammals that had dominated the land uptil now, and the newly emerged archosaurian reptiles (thecodonts).
- It is interesting that as the archosaurian reptiles were becoming larger, the cynodonts became smaller, perhaps nocturnal.
- The first vertebrates to evolve true flight were the pterosaurs, flying archosaurian reptiles.
Definition of archosaur in:
- The British & World English dictionary