The word "bilirubin" is often misspelled as "biliphaein". This error may be due to confusion with the chemical structure of this yellow pigment found in bile. The correct spelling of "bilirubin" includes an 'r' in the second syllable and an 'i' after the 'l' in the first syllable. The IPA transcription for "bilirubin" is /bɪˈlɪrjuːbɪn/. It is important to use the correct spelling in medical contexts as bilirubin levels can indicate liver function and health.