| NOUN | time | Silurian period, Silurian | from 425 million to 405 million years ago |
|---|
| Meaning | From 425 million to 405 million years ago; first air-breathing animals. | |
|---|---|---|
| Synonym | Silurian | |
| Instance of | period, geological period | A unit of geological time during which a system of rocks formed |
| Part of | Paleozoic, Paleozoic era | From 544 million to about 230 million years ago |
| Spanish | siluriano, silúrico | |
| Catalan | silurià | |
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