/ Thesaurus / U Synonyms of urobilin Find synonyms for: Noun1. urobilin, animal pigmentusage: brown bile pigment formed from urobilinogens and found in feces and in small amounts in urineWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language