Teunoscope or Teinoscope: How To spell?

The word Teunoscope is misspelled against Teinoscope, a noun meaning "An instrument formed by combining prisms so as to correct the chromatic aberration of the light while linear dimensions of objects seen through the prisms are increased or diminished; -- called also prism telescope."

Word contains consecutive vowels 'EI' in between alphabets t & noscope is misspelled as 'EU'
Wrong Spelling:  t-eu-noscope 
Correct Spelling:  t-ei-noscope 
Check more misspelled words of Teinoscope to spell it correct.