water plantain wa·terp·lan·tain uncommon noun 1. marsh plant having clusters of small white or pinkish flowers and broad pointed or rounded leaves Synonymswater plantainAlisma plantago-aquatica Related words Word family water-plantain family Broader terms marsh plant Narrower terms ribbon-leaved water plantainnarrow-leaved water plantain Parts Alisma WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
