/ Thesaurus / B Synonyms of black spleenwort Find synonyms for: Noun1. black spleenwort, Asplenium adiantum-nigrum, spleenwortusage: spleenwort of Europe and Africa and Asia having pinnate fronds and yielding an astringentWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: plausible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language