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Ordovician n. 奧陶紀,奧陶系
a. 奧陶紀的 奧陶紀,奧陶系奧陶紀的 Ordovician n 1: from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds [synonym: {Ordovician}, {Ordovician period}] Ordovician \Or`do*vi"cian\, a. [From L. Ordovices, a Celtic
people in Wales.] (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. [1913 Webster]
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