Etymology: From plumula, diminutive of pluma "feather"; compare French plumule.
- (botany) The first bud, or gemmule, of a young plant; the bud, or growing point, of the embryo, above the cotyledons.
- (zoology) A down feather.
- (zoology) The aftershaft of a feather.
- (zoology) One of the featherlike scales of certain male butterfly, butterflies.
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