Botany. the bud of the ascending axis of a plant while still in the embryo.
Ornithology. a down feather.

1720–30; < Neo-Latin, Latin plūmula. See plume, -ule

plumular [ploom-yuh-ler] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plumule (ˈpluːmjuːl)
1.  the embryonic shoot of seed-bearing plants
2.  a down feather of young birds that persists in some adults
[C18: from Late Latin plūmula a little feather]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
plumule   (plm'yl)  Pronunciation Key 
The developing bud of a plant embryo, situated above the cotyledons and consisting of the epicotyl and immature leaves. See more at germination.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Germination is hypogeal and the plumule is sensitive to light.
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