pinion/ˈpɪnjən/复数形式pinions1飞羽, 翼羽a specific section of a bird's wing that includes the flight feathers同义词： pennon2飞羽, 鸟的翅膀或尾巴上的大羽毛any of the larger wing or tail feathers of a bird同义词： quill featherflight featherquill3小齿轮, 齿圈a gear with a small number of teeth designed to mesh with a larger wheel or rack