vane

A weathervane.

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 moved by or used to move a fluid.

The flattened, weblike part of a feather, consisting of a series of barbs on either side of the shaft.

The movable target on a leveling rod.

A sight on a quadrant or compass.

One of the metal guidance or stabilizing fins attached to the tail of a bomb or other missile.

A flag or pennon.—

A weathercock; a device which is moved by the wind in such a manner as to show the wind’s direction; a weathervane.

A device used on shipboard to answer the purpose of a weathercock: generally called dogvane.