| 单词 | Ordovician |
| 释义 | Word Frequency Ordovician(ˌɔːdəʊˈvɪʃɪən) adjective 1. of, denoting, or formed in the second period of the Palaeozoic era, between the Cambrian and Silurian periods, which lasted for 45 000 000 years during which marine invertebrates flourished noun 2. the Ordovician Word origin C19: from Latin Ordovices ancient Celtic tribe in N Wales |
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