aerovane
noun
aero·vane
ˈer-ō-ˌvān
plural aerovanes
: a weather vane that is equipped with a propeller and is used to measure both wind speed and direction
Today, aerovanes often combine the duties of anemometers and weather vanes.—Kris Hirschmann, Forecasting!, 2008
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Merriam-Webster unabridged
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