a small barb.
any of the small processes fringing the barbs of a feather.
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British Dictionary definitions for barbule
a very small barb
ornithol any of the minute hairs that project from a barb and in some feathers interlock by hooks and grooves, forming a flat vane
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for barbule
A small barb or pointed projection, especially one that fringes the edges of the barbs of feathers.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.