ˈbär(ˌ)byül noun
( -s )
Etymology: Latin barbula little beard
: a minute barb or beard:
a. : barbel II 1
b. : one of the processes along either side of a barb of a feather, those on the upper side resembling slender scroll-like plates and terminating in a thickened flange with which the hooks of the barbicels that terminate the barbules of the lower margin of an adjacent barb mesh