/ Thesaurus / R Synonyms of rubia tinctorum Find synonyms for: Noun1. madder, Rubia tinctorum, madderwort, rubiaceous plantusage: Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarinWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language