Serulation or Serrulation: How To spell?
The word Serulation is misspelled against Serrulation, a noun meaning "One of the teeth in a serrulate margin."
Serrulation has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings se & ulation which should not be misspelled with single 'R'
Wrong Spelling:  se-r-ulation  Correct Spelling:  se-rr-ulation 
Check more misspelled words of Serrulation to spell it correct.