Definition of Ordovecian
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.
- Webster's Unabridged Dictionary (1913)
- (geology) of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 490 to 445 million years ago
- (geology) the Ordovician period
- The Nuttall Encyclopedia
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