American featherfoil ame·ri·can·featherfoil uncommon noun 1. a featherfoil of the eastern United States with submerged spongy inflated flower stalks and white flowers Synonymswater gillyflowerAmerican featherfoilHottonia inflata Related words Broader terms featherfoil WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
