Definition of saurischian
: any of an order (Saurischia) of herbivorous or carnivorous dinosaurs that have the pubis of the pelvis typically pointed downward and forward and that include the sauropods and theropods — compare ornithischian
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Merriam-Webster unabridged
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Time Traveler for saurischian
The first known use of saurischian was circa 1889
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