/ Thesaurus / C Synonyms of circus aeruginosus Find synonyms for: Noun1. marsh harrier, Circus Aeruginosus, harrierusage: Old World harrier frequenting marshy regionsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language