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| ar·cho·saur [ rkə sàwr ] (plural ar·cho·saurs) or ar·cho·saur·i·an [ rkə sáwree ən ] (plural ar·cho·saur·i·ans) |
noun |
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| Definition: |
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crocodile or relative: a relatively advanced and active reptile that became predominant on land during the Mesozoic era. Superorder Archosauria.
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| [Mid-20th century. < modern Latin Archosauria< Greek arkhos "chief" + sauros "lizard"] |
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