Semianular or Semiannular: How To spell?
The word Semianular is misspelled against Semiannular, an adjective meaning "Having the figure of a half circle; forming a semicircle."
Semiannular has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings semia & ular which should not be misspelled with single 'N'
Wrong Spelling:  semia-n-ular  Correct Spelling:  semia-nn-ular 
Check more misspelled words of Semiannular to spell it correct.