What is the definition of Ordovician period? | Dictionary.net

ORDOVICIAN PERIOD

\ˌɔːdəvˈɪʃən pˈi͡əɹɪəd], \ˌɔːdəvˈɪʃən pˈi‍əɹɪəd], \ˌɔː_d_ə_v_ˈɪ_ʃ_ə_n p_ˈiə_ɹ_ɪ__ə_d]\

Definitions of ORDOVICIAN PERIOD

2011 - English Dictionary Database
2006 - WordNet 3.0

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from 425 million to 500 million years ago; conodonts and ostracods and algae and seaweeds

2011 - English Dictionary Database
By DataStellar Co., Ltd

from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds

2006 - WordNet 3.0
By Princeton University

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