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Webster's 1913 Dictionary

BARBULE

Bar "bule, n. Etym: [L. barbula, fr. barba beard. ]

1. A very minute barb or beard. Booth.

2. (Zoöl.)

Defn: One of the processes along the edges of the barbs of a feather, by which adjacent barbs interlock. See Feather.

New American Oxford Dictionary

barbule

bar bule |ˈbärˌbyo͞ol ˈbɑrbjul | ▶noun a minute filament projecting from the barb of a feather. ORIGIN mid 19th cent.: from Latin barbula, diminutive of barba ‘beard. ’

Oxford Dictionary

barbule

barbule |ˈbɑːbjuːl | ▶noun a minute filament projecting from the barb of a feather. ORIGIN mid 19th cent.: from Latin barbula, diminutive of barba ‘beard ’.