Subronchial or Subbronchial: How To spell?
The word Subronchial is misspelled against Subbronchial, an adjective meaning "Situated under, or on the ventral side of, the bronchi; as, the subbronchial air sacs of birds."
Subbronchial has double "bb" is mispronounced as "b"Remember double 'BB' in between the strings Su & ronchial which should not be misspelled with single 'B'
Wrong Spelling:  Su-b-ronchial  Correct Spelling:  Su-bb-ronchial 
Check more misspelled words of Subbronchial to spell it correct.