sea onion seao·nion uncommon obsolete noun 1. having dense spikes of small white flowers and yielding a bulb with medicinal properties Synonymssea squillsea onionsquillUrginea maritima 2. European scilla with small blue or purple flowers Synonymsspring squillScilla vernasea onion Related words Broader terms scillaliliaceous plant Parts Urginea Part of squill WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
