saurian Syllabification: (sau·ri·an)Pronunciation: /ˈsôrēən/Definition of saurian adjective of or like a lizard. noun any large reptile, especially a dinosaur or other extinct form. Origin: early 19th century: from modern Latin Sauria (see Sauria) + -ansaurian in other Oxford dictionaries Definition of saurian in the British & World English dictionary