n. 胚芽, 绒羽

[医] 胚芽, 细沟(中脑水管上壁)

[ noun ]
down feather of young birds; persists in some adult birds
<noun.animal>

Plumula \Plu"mu*la\, n.; pl. L. {Plumule}, E.{-las}. [L. See
{Plumule}.]
1. (Bot.) A plumule.

2. (Zo["o]l.) A down feather.


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.

2. (Zo["o]l.)
(a) A down feather.
(b) The aftershaft of a feather. See Illust. under
{Feather}.
(c) One of the featherlike scales of certain male
butterflies.