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Noun1.Feather-foil - a plant of the genus Hottoniafeather-foil - a plant of the genus Hottonia  
genus Hottonia, Hottonia - aquatic herbs
American featherfoil, Hottonia inflata, water gillyflower - a featherfoil of the eastern United States with submerged spongy inflated flower stalks and white flowers
Hottonia palustris, water violet - featherfoil of Europe and western Asia having submerged and floating leaves and violet flowers
aquatic plant, hydrophyte, hydrophytic plant, water plant - a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth