Gibous or Gibbous: How To spell?
The word Gibous is misspelled against Gibbous, an adjective meaning "Hunched; hump-backed."
Gibbous has double "bb" is mispronounced as "b"Remember double 'BB' in between the strings Gi & ous which should not be misspelled with single 'B'
Wrong Spelling:  Gi-b-ous  Correct Spelling:  Gi-bb-ous 
Check more misspelled words of Gibbous to spell it correct.