Milimetre or Millimetre: How To spell?
The word Milimetre is misspelled against Millimetre, a noun meaning "A lineal measure in the metric system, containing the thousandth part of a meter; equal to .03937 of an inch. See 3d Meter."
Millimetre has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings mi & imetre which should not be misspelled with single 'L'
Wrong Spelling:  mi-l-imetre  Correct Spelling:  mi-ll-imetre 
Find more wrongly spelled words of Millimetre to spell it well.