/ Thesaurus / U Synonyms of ulvaceae Find synonyms for: Noun1. Ulvaceae, family Ulvaceae, sea-lettuce family, protoctist familyusage: thin flat or tubular green algaeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language