Treadmil or Treadmill: How To spell?
The word Treadmil is misspelled against Treadmill, a noun meaning "A mill worked by persons treading upon steps on the periphery of a wide wheel having a horizontal axis. It is used principally as a means of prison discipline. Also, a mill worked by horses, dogs, etc., treading an endless belt."
Treadmill has double 'll' in the end mispronounced as 'l'Remember double 'LL' appears in the end of this word which should not be misspelled with single 'L'
Wrong Spelling:  treadmi-l  Correct Spelling:  treadmi-ll 
Find more wrongly spelled words of Treadmill to spell it well.