Down feather of young birds; persists in some adult birds.

Roget 167: posterity, progeny, breed, issue, offspring, brood, litter, seed, farrow, spawn, spat; family, grandchildren, heirs; great-grandchild.    child, son, daughter; butcha^†; bantling, scion; acrospire^†, plumule^†, shoot, sprout, olive-branch, sprit^†, branch; off-shoot, off-set; ramification; descendant; heir, heiress; heir-apparent, heir-presumptive; chip off the old block; heredity; rising generation.    straight descent, sonship^†, line, lineage, filiation^†, primogeniture.    ... show more