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Silurian▼(of period from 439 to 409 million years ago)adjective[UK: saɪ.ˈljʊə.rɪən] [US: saɪ.ˈljʊə.rɪən]
Silurian▼(Silurian period)proper noun[UK: saɪ.ˈljʊə.rɪən] [US: saɪ.ˈljʊə.rɪən]
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