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1. A down feather.
2. The young shoot of a plant embryo above the cotyledons, consisting of the epicotyl and often of immature leaves.
[Latin plūmula, diminutive of plūma, feather.]
plu′mu·lose′ (plo͞om′yə-lōs′) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Biology) biology having hairs that branch out like feathers
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014