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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 Or·do·vi·cian /ˌɔrdəˈvɪʃən/
 奧陶紀,奧陶系(a.)奧陶紀的

From: Webster's Revised Unabridged Dictionary (1913)

 Or·do·vi·cian a.  Geol. Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian. -- n. The Ordovician formation.
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From: WordNet (r) 2.0

 Ordovician
      n : from 500 million to 425 million years ago; conodonts and
          ostracods and algae and seaweeds [syn: Ordovician period]