Trigramatic or Trigrammatic: How To spell?
The word Trigramatic is misspelled against Trigrammatic, an adjective meaning "Containing three letters or characters, or three sets of letters or characters."
Trigrammatic has double "mm" is mispronounced as "m"Remember double 'MM' in between the strings trigra & atic which should not be misspelled with single 'M'
Wrong Spelling:  trigra-m-atic  Correct Spelling:  trigra-mm-atic 
Find more wrongly spelled words of Trigrammatic to spell it well.