noun
an extinct marine reptile of the Mesozoic era, resembling a dolphin with a long pointed snout and four flippers
adjective
related to or resembling an ichthyosaurus
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The ichthyosaurus was a marine reptile that lived during the Mesozoic era.
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Have you seen the fossil of the ichthyosaurus at the museum?
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That ichthyosaurus is one cool sea dino!
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Her graceful swimming reminded me of an ichthyosaurus gliding through the water.