(n.) 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.

Mach meter accelerometer anemograph anemometrograph anemoscope cock ground log harpoon log log log line patent log speedometer tachometer taffrail log vane weather vane weathercock wind cone wind gauge wind indicator wind sock wind vane wind-speed indicator