Barbule
Encyclopedia : B : BA : BAR : Barbule
Barbules are a part of the tree formed by feathers : the trunk, or axis, being the rachis and the barbs the main boughs, barbules are the secondary branches. Barbules have minute hooks called barbicels for cross-attachment".
References
- http://www.1911encyclopedia.org/F/FE/FEATHER.htm
- See also : [Wiktionary]
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