Plumule

1. (Bot.) The first bud, or gemmule, of a young plant; the bud, or growing point, of the embryo, above the cotyledons. See Illust. of Radicle.
1. A down feather.
2. The aftershaft of a feather. See Illust. under Feather.
3. One of the featherlike scales of certain male butterflies.