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1. Oxford Dictionary

   Ordovician

   • IPA[ˌɔːdə(ʊ)ˈvɪʃɪən]

   英式

   • adj.
     relating to or denoting the second period of the Palaeozoic era, between the Cambrian and Silurian periods
   • n.
     the second period of the Palaeozoic era, between the Cambrian and Silurian periods, or the system of rocks deposited during it
2. • 釋義

   adj.

   形容詞

   • 1. relating to or denoting the second period of the Palaeozoic era, between the Cambrian and Silurian periods fossils found in Cambrian and Ordovician rocks

   n.

   名詞

   • 1. the second period of the Palaeozoic era, between the Cambrian and Silurian periods, or the system of rocks deposited during it these are mobile predators that have a fossil record reaching back to the Ordovician
3. • 更多解釋

   Ordovician

   • IPA[ˌôrdəˈviSH(ə)n]

   美式

   • adj.
     relating to or denoting the second period of the Paleozoic era, between the Cambrian and ... fossils found in Cambrian and Ordovician rocks
   • n.
     the second period of the Paleozoic era, between the Cambrian and Silurian periods, or the ... these are mobile predators that have a fossil record reaching back to the Ordovician

   Oxford American Dictionary