An instrument which shows the direction of the wind; a wind vane; a weathercock; -- usually applied to a contrivance consisting of a vane above, connected in the building with a dial or index with pointers to show the changes of the wind.

An instrument for indicating the existence and direction of the wind.

An anemoscope is an obsolete machine invented to show the direction of the wind, or to foretell a change of wind direction or weather.