We found 21 dictionaries that define the word plesiosaur:

General (18 matching dictionaries)

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

Computing (1 matching dictionary)

19. plesiosaur: Encyclopedia

Medicine (1 matching dictionary)

20. online medical dictionary (No longer online)

Slang (1 matching dictionary)

21. plesiosaur: Urban Dictionary

(Note: See plesiosaurs as well.)

Definitions from Wiktionary (plesiosaur) ▸ noun:  Any of several extinct marine reptiles, of the order †Plesiosauria, from the Jurassic and Cretaceous periods. Similar: plesiosaurus, plesiosaurid, pliosaur, plesiosaurian, pliosaurid, pleurosaur, pleurosaurid, pelagosaur, pachypleurosaurid, pilosaurid, more... Opposite: Unfortunately Types: elasmosaurus, plesiosaurus, cryptoclidus, liopleurodon, polycotylus, kronosaurus, pliosaurus, more... Adjectives: necked, new, large, first, cretaceous, giant, marine, prehistoric, long ▸ Words similar to plesiosaur ▸ Usage examples for plesiosaur ▸ Idioms related to plesiosaur ▸ Wikipedia articles (New!) ▸ Popular adjectives describing plesiosaur ▸ Words that often appear near plesiosaur ▸ Rhymes of plesiosaur ▸ Invented words related to plesiosaur