Weather vane

Wikipedia Word definitions in Wikipedia
An anemoscope is a device invented to show the direction of the wind , or to foretell a change of wind direction or weather. Hygroscopic devices, in particular those utilizing catgut , were considered as very good anemoscopes, seldom failing to foretell ...

Wiktionary Word definitions in Wiktionary
n. An instrument that 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.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Anemoscope \A*nem"o*scope\, n. [Gr. ? wind + -scope: cf. F. an['e]moscope.] 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 ...