/ Thesaurus / S Synonyms of seagrass Find synonyms for: Noun1. seagrass, seaweedusage: any of various seaweeds that grow underwater in shallow beds; "seagrass provides a protective environment in which young fish can develop"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language