Definition of plumule

• pl. - of Plumula
• n. - The first bud, or gemmule, of a young plant; the bud, or growing point, of the embryo, above the cotyledons. See Illust. of Radicle.
• n. - A down feather.
• n. - The aftershaft of a feather. See Illust. under Feather.
• n. - One of the featherlike scales of certain male butterflies.