A weather vane.
Any of several usually relatively thin, rigid, flat, or sometimes curved surfaces radially mounted along an axis, as a blade in a turbine or a sail on a windmill, that is turned by or used to turn a fluid.
A sight on a sextant or compass.
One of the metal guidance or stabilizing fins attached to the tail of a bomb or other missile.
The flattened, web-like part of a feather, consisting of a series of barbs on either side of the shaft.
A weather vane, sometimes in the form of a cockerel.
A kind of wind pump whose top behaves like a weather vane, moving with the wind direction, but which also has a wheel attached to measure wind speed.
One who veers with every change of current opinion; a fickle, inconstant person.
To act as a weathercock for.
To turn upwind because of the difference in water pressure on two sides.
To veer into the direction of the oncoming (relative) wind.