Fisipalmate or Fissipalmate: How To spell?
The word Fisipalmate is misspelled against Fissipalmate, an adjective meaning "Semipalmate and loboped, as a grebe's foot. See Illust. under Aves."
Fissipalmate has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings fi & ipalmate which should not be misspelled with single 'S'
Wrong Spelling:  fi-s-ipalmate  Correct Spelling:  fi-ss-ipalmate 
Find more wrongly spelled words of Fissipalmate to spell it well.