Usually means: Extinct aquatic bird, dinosaur era.
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We found 13 dictionaries that define the word Hesperornis:

General (12 matching dictionaries)
  1. Hesperornis: Merriam-Webster
  2. hesperornis: Wordnik
  3. hesperornis: Infoplease Dictionary
  4. Hesperornis, hesperornis: Dictionary.com
  5. Hesperornis: Wikipedia, the Free Encyclopedia
  6. Hesperornis: Online Plain Text English Dictionary
  7. hesperornis: Webster's Revised Unabridged, 1913 Edition
  8. Hesperornis: AllWords.com Multi-Lingual Dictionary
  9. hesperornis: FreeDictionary.org
  10. Hesperornis: TheFreeDictionary.com
  11. Hesperornis, Hesperornis: Merriam-Webster

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

Definitions from Wikipedia (Hesperornis)

noun:  (meaning "western bird") a genus of cormorant-like Ornithuran that spanned throughout the Campanian age, and possibly even up to the early Maastrichtian age, of the Late Cretaceous period.


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