'Barbule' definitions:
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Barbule \Bar"bule\, n. [L. barbula, fr. barba beard.]
[1913 Webster]
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1. A very minute barb or beard. --Booth.
[1913 Webster]
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2. (Zool.) One of the processes along the edges of the barbs
of a feather, by which adjacent barbs interlock. See
Feather.
[1913 Webster]
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antenna,
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barb,
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barbel,
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barrel,
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cat whisker,
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cilium,
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feeler,
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filament,
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filamentule,
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palp,
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palpus,
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quill,
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shaft,
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tactile cell,
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tactile corpuscle,
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tactile hair,
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tactile organ,
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tactile process,
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tactor,
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vibrissa