Pyrameter or Peirameter: How To spell?

The word Pyrameter is misspelled against Peirameter, a noun meaning "A dynamometer for measuring the force required to draw wheel carriages on roads of different constructions."

Word contains consecutive vowels 'EI' in between alphabets p & rameter is misspelled as 'Y'
Wrong Spelling:  p-y-rameter 
Correct Spelling:  p-ei-rameter 
Explore spell check of Peirameter to spell without errors.