Etymology
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saurian (n.)

reptile of the order Sauria, 1819, from Modern Latin Sauria "the order of reptiles" (Brongniart, 1799), from Greek sauros "lizard" (see -saurus). As an adjective, "belonging to the Sauria," by 1829.

Sauropod for the suborder of the big plant-eating dinosaurs is by 1891, from Modern Latin sauropoda (Marsh, 1884), second element from Greek pous "foot" (from PIE root *ped- "foot"). Sauroid (n.) "a saurian animal" is by 1836, also as an adjective.

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Definitions of saurian
1
saurian (n.)
any of various reptiles of the suborder Sauria which includes lizards; in former classifications included also the crocodiles and dinosaurs;
2
saurian (adj.)
of or relating to lizards;
Synonyms: lacertilian
From wordnet.princeton.edu