plumule
noun
plu·mule
| \ ˈplü-(ˌ)myül
\
\
Definition of plumule
1
: the primary bud of a plant embryo usually situated at the apex of the hypocotyl and consisting of leaves and an epicotyl
2
: a down feather
Illustration of plumule
plumule of morning glory seedling: 1 hypocotyl, 2 plumule, 3 cotyledons
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