aero·​vane | \ˈer-ō-ˌvān \
plural aerovanes

Definition of aerovane 

: 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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First Known Use of aerovane

1950, in the meaning defined above

History and Etymology for aerovane

aero- + vane

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The first known use of aerovane was in 1950

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the figure or shape of a crescent moon

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