plu·mule

[ploom-yool]
noun
1.
Botany. the bud of the ascending axis of a plant while still in the embryo.
2.
Ornithology. a down feather.

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

plu·mu·lar [ploom-yuh-ler] , adjective
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Collins
World English Dictionary
plumule (ˈpluːmjuːl) [Click for IPA pronunciation guide]
 
n
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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00:10
Plumule is always a great word to know.
So is multicellular haploid. Does it mean:
organism with having only one complete set of chromosomes
female reproductive organ which produces eggs in bryophytes, ferns and most gymnosperms
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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