a hair-like prolongation of the sheath of a growing feather, forming part of the downy covering of the young of certain birds.
| 单词 | θ38820 |
| 释义 | the world > animals > birds > feather > [noun] > down or down-feather > on unfledged bird > part of (1) trichoptile1900 a hair-like prolongation of the sheath of a growing feather, forming part of the downy covering of the young of certain birds. |
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