Catarhal or Catarrhal: How To spell?
The word Catarhal is misspelled against Catarrhal, an adjective meaning "Pertaining to, produced by, or attending, catarrh; of the nature of catarrh."
Catarrhal has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings cata & hal which should not be misspelled with single 'R'
Wrong Spelling:  cata-r-hal  Correct Spelling:  cata-rr-hal 
Browse incorrect spellings of Catarrhal to spell it good.