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barbule

[bahr-byool] /ˈbɑr byul/
noun
1.
a small barb.
2.
any of the small processes fringing the barbs of a feather.
Origin
1825-1835
1825-35; < Latin barbula. See barb1, -ule
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for barbules

barbule

/ˈbɑːbjuːl/
noun
1.
a very small barb
2.
(ornithol) any of the minute hairs that project from a barb and in some feathers interlock by hooks and grooves, forming a flat vane
Word Origin
C19: from Latin barbula a little beard, from barba beard
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
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barbules in Science
barbule
  (bär'byl)   
A small barb or pointed projection, especially one that fringes the edges of the barbs of feathers.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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