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The Collaborative International Dictionary of English v.0.48 (gcide)

Plumule \Plu"mule\, n. [L. plumula, dim. of pluma a feather; cf.
F. 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}. --Gray.
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2. (Zool.)
(a) A down feather.
(b) The aftershaft of a feather. See Illust. under
{Feather}.
(c) One of the featherlike scales of certain male
butterflies.
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Plumula \Plu"mu*la\, n.; pl. L. {Plumule}, E.{-las}. [L. See
{Plumule}.]
1. (Bot.) A plumule.
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2. (Zool.) A down feather.
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