/ Thesaurus / S Synonyms of sea onion Find synonyms for: Noun1. sea squill, sea onion, squill, Urginea maritima, liliaceous plantusage: having dense spikes of small white flowers and yielding a bulb with medicinal properties2. spring squill, Scilla verna, sea onion, scilla, squillusage: European scilla with small blue or purple flowersWordNet 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