Bipinatifid or Bipinnatifid: How To spell?
The word Bipinatifid is misspelled against Bipinnatifid, an adjective meaning "Doubly pinnatifid."
Bipinnatifid has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings bipi & atifid which should not be misspelled with single 'N'
Wrong Spelling:  bipi-n-atifid  Correct Spelling:  bipi-nn-atifid 
Find more wrongly spelled words of Bipinnatifid to spell it well.