Interadial or Interradial: How To spell?
The word Interadial is misspelled against Interradial, an adjective meaning "Between the radii, or rays; -- in zoology, said of certain parts of radiate animals; as, the interradial plates of a starfish."
Interradial has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings inte & adial which should not be misspelled with single 'R'
Wrong Spelling:  inte-r-adial  Correct Spelling:  inte-rr-adial 
Find more wrongly spelled words of Interradial to spell it well.