ostrich feather
/ˈɒstrɪtʃ ˌfɛðə/ /ˈɒstrɪdʒ ˌfɛðə/noun
A feather of an ostrich, especially one of the long curly quill feathers from the wings or tail used as a personal ornament or for decorative purposes. Compare feather.
Origin
Late Middle English; earliest use found in Arderne's Treatises of Fistula in Ano. From ostrich + feather.