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ordovician |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: 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. From WordNet r 1.6 [wn]: Ordovician n : from 425 million to 500 million years ago; conodonts and ostracods and algae and seaweeds [syn: {Ordovician}, {Ordovician period}]
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