Definition of archosaur in English:



  • A reptile of a large group that includes the dinosaurs and pterosaurs and is represented today only by the crocodilians.

    Subdivision Archosauria, subclass Diapsida

    • ‘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.’
    • ‘Other archosaurs included the pterosaurs, relatives of dinosaurs but not true dinosaurs.’
    • ‘Tyrannosaurs are surprisingly common in many North American fossil beds, especially their large, serrated teeth which they shed periodically like most archosaurs.’
    • ‘The name ‘bird crocodile’ seems to nicely describe all the great archosaurs of Mesozoic, combining as they did features of both crocodiles and birds.’
    • ‘The archosaur skull includes two new fenestra (skull openings).’


1930s: from modern Latin Archosauria, from Greek arkhos ‘chief’ or arkhōn ‘ruler’ + -saur.