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We found 29 dictionaries with English definitions that include the word ordovician:
Click on the first link on a line below to go directly to a page where "ordovician" is defined.

General dictionaries General (25 matching dictionaries)
  1. Ordovician: Merriam-Webster.com [home, info]
  2. Ordovician, the Ordovician: Oxford Learner's Dictionaries [home, info]
  3. Ordovician: American Heritage Dictionary of the English Language [home, info]
  4. Ordovician, the Ordovician: Collins English Dictionary [home, info]
  5. Ordovician: Vocabulary.com [home, info]
  6. Ordovician: Wordnik [home, info]
  7. Ordovician: Wiktionary [home, info]
  8. Ordovician: Webster's New World College Dictionary, 4th Ed. [home, info]
  9. Ordovician: The Wordsmyth English Dictionary-Thesaurus [home, info]
  10. Ordovician: Infoplease Dictionary [home, info]
  11. Ordovician: Dictionary.com [home, info]
  12. Ordovician: Online Etymology Dictionary [home, info]
  13. Ordovician: UltraLingua English Dictionary [home, info]
  14. Ordovician: Wikipedia, the Free Encyclopedia [home, info]
  15. Ordovician: Online Plain Text English Dictionary [home, info]
  16. ordovician: Webster's Revised Unabridged, 1913 Edition [home, info]
  17. Ordovician: Rhymezone [home, info]
  18. Ordovician: AllWords.com Multi-Lingual Dictionary [home, info]
  19. Ordovician: Hutchinson's Dictionary of Difficult Words [home, info]
  20. ordovician: Free Dictionary [home, info]
  21. Ordovician: Hutchinson Dictionaries [home, info]
  22. ordovician: Mnemonic Dictionary [home, info]
  23. ordovician: WordNet 1.7 Vocabulary Helper [home, info]
  24. Ordovician: LookWAYup Translating Dictionary/Thesaurus [home, info]
  25. Ordovician: Dictionary/thesaurus [home, info]

Computing dictionaries Computing (1 matching dictionary)
  1. Ordovician: Encyclopedia [home, info]

Medicine dictionaries Medicine (1 matching dictionary)
  1. ordovician: online medical dictionary [home, info]

Science dictionaries Science (2 matching dictionaries)
  1. Ordovician: Tree of Life Glossary [home, info]
  2. Ordovician: USGS Paleontology Glossary of Terms [home, info]

Quick definitions from WordNet (Ordovician)

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

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Phrases that include ordovician:   ordovician period, middle ordovician, ordovician radiation, ordovician silurian extinction events more...

Words similar to ordovician:   ordovician period, more...

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