The Merriam-Webster Dictionary defines bilirubin as “a reddish-yellow water insoluble pigment occurring especially in bile and blood causing jaundice if accumulated in excess.”

Writing “bilirubin” on the machine, syllable by syllable, would be as follows:
BIL/LAOE/RAOUB/*IN or BIL/LI/RAOUB/*IN
However, a short cut that can be used is as follows:
BIL/RAOUB