pinfeather

详细解释:n. (鸟的)新生毛

详细解释：

pin.feath.er

n.（名词）
A growing feather still enclosed in its horny sheath, especially one just emerging through the skin.
（鸟类的）新生毛：一种裹在角鞘中的新生毛，特别是刚刚冒出皮肤外的羽毛