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wind vane:see weather vaneweather vane
or wind vane,
instrument used to indicate wind direction. It consists of an asymmetrically shaped object, e.g., an arrow or a rooster, mounted at its center of gravity so it can move freely about a vertical axis.
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wind vane[′win ‚vān]
An instrument used to indicate wind direction, consisting basically of an asymmetrically shaped object mounted at its center of gravity about a vertical axis; the end which offers the greater resistance to the motion of air moves to the downwind position; the direction of the wind is determined by reference to an attached oriented compass rose.
A device to indicate wind direction. A wind vane always points into the wind. It works on the principle of weathercocking. See weather vane.