·noun A down feather.
II. Plumule ·pl of Plumula.
III. Plumule ·noun One of the featherlike scales of certain male butterflies.
IV. Plumule ·noun The aftershaft of a feather. ·see ·Illust. under Feather.
V. Plumule ·noun The first bud, or gemmule, of a young plant; the bud, or growing point, of the embryo, above the cotyledons. ·see ·Illust. of Radicle.