PLUMULE
plumule
(noun) down feather of young birds; persists in some adult birds
Source: WordNet® 3.1
Etymology
Noun
plumule (plural plumules)
(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 butterflies.
Source: Wiktionary
Plu"mule, n. Etym: [L. plumula, dim. of pluma a feather; cf. F.
plumule.]
1. (Bot.)
Definition: 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.
2. (Zoöl.)
(a) A down feather.
(b) The aftershaft of a feather. See Illust. under Feather.
(c) One of the featherlike scales of certain male butterflies.
Source: Webster’s Unabridged Dictionary 1913 Edition