Definify.com

Webster 1913 Edition

Noun.

[1st

uro-

bile

-in

(Physiol. Chem.)

A yellow pigment identical with hydrobilirubin, abundant in the highly colored urine of fever, and also present in normal urine. See

urobilin ‎(uncountable)

(biochemistry) A yellow linear tetrapyrrole resulting from the breakdown of heme, produced when urobilinogen is oxidized by intestinal bacteria.

tetrapyrrole