ordovician


From The Collaborative International Dictionary of English v.0.48:

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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