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1. (adj.) Ordovician
noting or pertaining to a geologic period of the Paleozoic Era, from 500 million to 425 million years ago, notable for the advent of fish.
2. (n.) Ordovician
the Ordovician Period or System.
Etymology: (1879; after the Ordovices (pl.) (< L) an ancient British tribe in N Wales )
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| Definition of 'ordovician' |
Princeton's WordNet |
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1. (noun) Ordovician, Ordovician period
from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
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Definitions of ordovician 
