Definition of archosaur in English:

archosaur

Syllabification: ar·cho·saur
Pronunciation: /ˈärkəˌsôr
 
/
(also archosaurus /ˌärkəˈsôrəs/)

noun

Zoology & Paleontology
A reptile of a large group that includes the dinosaurs and pterosaurs, represented today only by the crocodilians.
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).

Origin

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

Derivatives

archosaurian

Pronunciation: /ˌärkəˈsôrēən/
adjective
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:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day deictic
Pronunciation: ˈdeɪktɪk
adjective
denoting a word whose meaning depends on context...