plumule
/ˈpluːmjuːl/noun
1
- Botany the rudimentary shoot or stem of an embryo plant【植】胚芽。
2
- Ornithology a bird's down feather, numbers of which form an insulating layer under the contour feathers【鸟】绒羽。
词源
early 18th cent.: from French plumule or Latin plumula 'small feather'， diminutive of pluma 'down'.