Biserate or Biserrate: How To spell?
The word Biserate is misspelled against Biserrate, an adjective meaning "Doubly serrate, or having the serratures serrate, as in some leaves."
Biserrate has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings bise & ate which should not be misspelled with single 'R'
Wrong Spelling:  bise-r-ate  Correct Spelling:  bise-rr-ate 
Find more wrongly spelled words of Biserrate to spell it well.