Plesiosour or Plesiosaur: How To spell?
The word Plesiosour is misspelled against Plesiosaur, a noun meaning "One of the Plesiosauria."
Word contains consecutive vowels 'AU' in between alphabets plesios & r is misspelled as 'OU'Wrong Spelling:  plesios-ou-r  Correct Spelling:  plesios-au-r 
Check more misspelled words of Plesiosaur to spell it correct.