ClipArt ETC
"Filoplume. In ornithology, a thread-feather; a thread-like or hair-like feather, with a very slender stem, lacking webs in most or all of its length." -Whitney, 1911

Filoplume of a Goose

"Filoplume. In ornithology, a thread-feather; a thread-like or hair-like feather, with a very slender…