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A hairlike feather having few or no barbs, usually located between contour feathers.
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.
(Zoology) ornithol any of the hairlike feathers that lack vanes and occur between the contour feathers
[C19: from New Latin fīloplūma, from Latin fīlum thread + plūma feather]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014