Micromilimeter or Micromillimeter: How To spell?
The word Micromilimeter is misspelled against Micromillimeter, a noun meaning "The millionth part of a meter."
Micromillimeter has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings micromi & imeter which should not be misspelled with single 'L'
Wrong Spelling:  micromi-l-imeter  Correct Spelling:  micromi-ll-imeter 
Find more incorrect spellings of Micromillimeter to spell right way.