Hypertext Webster Gateway: "Ordovician"
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) 1.7 (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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