/ Thesaurus / P Synonyms of penumbral Find synonyms for: Adjective1. penumbralusage: of or pertaining to the region of partial shadow around an umbraWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language