Silurian
si·lu·rian
noun
1.
from 425 million to 405 million years ago; first air-breathing animals
Origin
From Latin Silurēs + English -ian.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.