/ Thesaurus / H Synonyms of hieracium Find synonyms for: Noun1. Hieracium, genus Hieracium, asterid dicot genususage: large genus of perennial hairy herbs of Europe to western Asia to northwestern Africa and North America; few are ornamental; often considered congeneric with PilosellaWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language