Usually means: Prehistoric reptiles, extinct, varied sizes.
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We found 32 dictionaries that define the word dinosaur:

General (24 matching dictionaries)
  1. dinosaur: Merriam-Webster
  2. dinosaur: Oxford Learner's Dictionaries
  3. dinosaur: American Heritage Dictionary of the English Language
  4. dinosaur: Collins English Dictionary
  5. dinosaur: Vocabulary.com
  6. Dinosaur, dinosaur: Wordnik
  7. dinosaur: Cambridge Advanced Learner's Dictionary
  8. dinosaur: Wiktionary
  9. dinosaur: Webster's New World College Dictionary, 4th Ed.
  10. dinosaur: The Wordsmyth English Dictionary-Thesaurus
  11. dinosaur: Infoplease Dictionary
  12. dinosaur: Dictionary.com
  13. dinosaur: Online Etymology Dictionary
  14. dinosaur: Cambridge Essential American English Dictionary
  15. D.I.N.O.S.A.U.R, Dinosaur (B'z album), Dinosaur (Dinosaur Jr. album), Dinosaur (Disney's Animal Kingdom), Dinosaur (Kesha song), Dinosaur (Kisschasy song), Dinosaur (band), Dinosaur (disambiguation), Dinosaur (film), Dinosaur (movie), Dinosaur, Dinosaur: Wikipedia, the Free Encyclopedia
  16. Dinosaur: Online Plain Text English Dictionary
  17. dinosaur: Rhymezone
  18. dinosaur: AllWords.com Multi-Lingual Dictionary
  19. dinosaur: FreeDictionary.org
  20. dinosaur: Mnemonic Dictionary
  21. dinosaur: TheFreeDictionary.com
  22. dinosaur: Longman Dictionary of Contemporary English

Computing (2 matching dictionaries)
  1. dinosaur: Free On-line Dictionary of Computing
  2. dinosaur: Encyclopedia

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

Miscellaneous (1 matching dictionary)
  1. Brilliant Dream Dictionary (No longer online)

Science (2 matching dictionaries)
  1. Dinosaurs (No longer online)
  2. DINOSAUR: Zoom Astronomy Glossary

Slang (2 matching dictionaries)
  1. dinosaur: Green’s Dictionary of Slang
  2. dinosaur: ESL Slang page

(Note: See dinosaurian as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (sciences) Any of the animals belonging to the clade Dinosauria, especially those that existed during the Triassic, Jurassic and Cretaceous periods and are now extinct.
noun:  (colloquial) Any member of the clade Dinosauria other than birds.
noun:  (proscribed) Any extinct reptile, not necessarily belonging to Dinosauria, that existed between about 230 million and 65 million years ago, as well as the stem-mammal Dimetrodon.
noun:  (figuratively, colloquial) Something or someone that is very old or old-fashioned, or is not willing to change and adapt.
noun:  (figuratively, colloquial) Anything no longer in common use or practice.

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