Usually means: Geological period after Cambrian, before Silurian.
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We found 9 dictionaries that define the word Ordovian:

General (8 matching dictionaries)
  1. ordovian: Wordnik
  2. Ordovian: Wiktionary
  3. Ordovian, ordovian: Dictionary.com
  4. Ordovian: Online Plain Text English Dictionary
  5. ordovian: Webster's Revised Unabridged, 1913 Edition
  6. Ordovian: AllWords.com Multi-Lingual Dictionary
  7. ordovian: FreeDictionary.org
  8. Ordovian: TheFreeDictionary.com

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (Ordovian)

adjective:  Alternative form of Ordovician [(geology) Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 488 to 443 million years ago.]
noun:  Alternative form of Ordovician [(geology) The Ordovician period.]

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