/ Thesaurus / H Synonyms of horsefly weed Find synonyms for: Noun1. indigo broom, horsefly weed, rattle weed, Baptisia tinctoria, wild indigo, false indigousage: much-branched erect herb with bright yellow flowers; distributed from Massachusetts to FloridaWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: sublime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language