/ Thesaurus / B Synonyms of brassica nigra Find synonyms for: Noun1. black mustard, Brassica nigra, mustardusage: widespread Eurasian annual plant cultivated for its pungent seeds; a principal source of table mustardWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language