Usually means: Geological period following Cambrian era.
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We found 24 dictionaries that define the word Ordovician:

General (20 matching dictionaries)
  1. Ordovician, Ordovician: Merriam-Webster
  2. Ordovician, the Ordovician: Oxford Learner's Dictionaries
  3. Ordovician: American Heritage Dictionary of the English Language
  4. Ordovician, the Ordovician: Collins English Dictionary
  5. Ordovician: Vocabulary.com
  6. Ordovician: Wordnik
  7. Ordovician: Wiktionary
  8. Ordovician: Webster's New World College Dictionary, 4th Ed.
  9. Ordovician: The Wordsmyth English Dictionary-Thesaurus
  10. Ordovician: Infoplease Dictionary
  11. Ordovician: Dictionary.com
  12. Ordovician: Online Etymology Dictionary
  13. Ordovician: Wikipedia, the Free Encyclopedia
  14. Ordovician: Online Plain Text English Dictionary
  15. ordovician: Webster's Revised Unabridged, 1913 Edition
  16. Ordovician: Rhymezone
  17. Ordovician: AllWords.com Multi-Lingual Dictionary
  18. ordovician: FreeDictionary.org
  19. ordovician: Mnemonic Dictionary
  20. Ordovician: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Ordovician: Encyclopedia

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

Science (2 matching dictionaries)
  1. Tree of Life Glossary (No longer online)
  2. Ordovician: USGS Paleontology Glossary of Terms

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Definitions from Wiktionary (Ordovician)

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

Similar:
ordovician period, Ordovian, Devonian, Paleozoic, Cambrian, Palaeozoic, Palæozoic, Silurian, Paleogene, Carboniferous, more...

Phrases:
middle ordovician, late ordovician, early ordovician, ordovician period, ordovician system, more...

Adjectives:
late, early, cambro, middle, lower, cambrian, upper, mid, uppermost, pre, basal

Colors:
    slate gray,     olive green,     sandstone,     rust,     deep teal, more...
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Similar:
ordovician period, Ordovian, Devonian, Paleozoic, Cambrian, Palaeozoic, Palæozoic, Silurian, Paleogene, Carboniferous, more...

Phrases:
middle ordovician, late ordovician, early ordovician, ordovician period, ordovician system, ordovician extinction, Late Ordovician mass extinction, Late Ordovician glaciation, more...

Adjectives:
late, early, cambro, middle, lower, cambrian, upper, mid, uppermost, pre, basal

Colors:
    slate gray,     olive green,     sandstone,     rust,     deep teal, more...



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