barbule

詳細解釋：

bar.bule

n.Zoology （名詞）【動物學】
A small barb or pointed projection, especially one of the small projections fringing the edges of the barbs of feathers.
羽小支：小羽支或尖狀凸起物，尤指沿羽支邊緣排列的小凸起

來源：
Latin barbula [diminutive of] barba [beard] * see bhardh-3-
拉丁語 barbula [] barba的小後綴 [須] *參見 bhardh-3-