/ Thesaurus / A Synonyms of alternanthera philoxeroides Find synonyms for: Noun1. alligator weed, alligator grass, Alternanthera philoxeroides, weedusage: prolific South American aquatic weed having grasslike leaves and short spikes of white flowers; clogs waterways with dense floating massesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language