noun
aetosaur - a type of extinct reptile that lived during the Triassic period
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The aetosaur is an extinct group of heavily armored, quadrupedal herbivorous archosaurs.
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Did you know that the aetosaur was like a prehistoric tank with its thick armor?
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That aetosaur was one tough cookie back in the day!
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Facing that challenge was like going up against an aetosaur - daunting and intimidating.