One of the light, flat growths forming the plumage of birds, consisting of numerous slender, closely arranged parallel barbs forming a vane on either side of a horny, tapering, partly hollow shaft.

• 羽毛构成鸟类羽毛的轻且平的一种生长物，由大量细长的、紧密并列的钩在一个角状的、中空的锥形羽轴两边所形成的羽片