/ Thesaurus / I Synonyms of indigo plant Find synonyms for: Noun1. indigo, indigo plant, Indigofera tinctoria, shrub, bushusage: deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dyeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language