plumule ( synonym found)
Definition of plumule:

(n) : the first bud, or gemmule, of a young plant; the bud, or growing point, of the embryo, above the cotyledons; a down feather
Definition of plumule:

(n) : the first bud, or gemmule, of a young plant; the bud, or growing point, of the embryo, above the cotyledons; a down feather
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