n.[C]

1. 【气】风向标
2. （螺旋桨等的）翼；叶片
3. 反复无常的人
4. 瞄准板
5. （鸟的）羽片

n.

1. a broad blade attached to a rotating axis or wheel which pushes or is pushed by wind or water, forming part of a device such as a windmill, propeller, or turbine.
   ▸a weathervane.
2. a projecting surface designed to guide the motion of a projectile, e.g. a feather on an arrow.
3. the flat part on either side of the shaft of a feather.