an individual tiny branch or filament projecting from a feather's barb; these barbules often have microscopic hooks or grooves that interlock with those of neighboring barbules to form and hold the feather vane.

羽毛の小さな枝（羽枝から分かれた細い分枝）。微小なフックや溝を持ち、隣接する小羽枝と絡み合って羽弁を形成・保持する部分

a small bristle-like or barbed projection on a plant or animal structure (used in specialized biological contexts).

（植物・動物学）小さな毛状・とげ状の突起。専門的領域で使われる用語