Definition
"Feather-foil" is simply an alternative spelling of "featherfoil." It refers to aquatic plants with finely divided, feather-like leaves, especially those in the genus Hottonia. It is essentially the same plant, just with a hyphenated spelling. Consider it like the British vs. American spelling of "color" and "colour". Itβs a minor variation in how the word is written, not a different plant. The plant contributes to aquatic ecosystems by providing shelter and oxygen.