wind vane

[wind]
noun

Origin:
1715–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To wind vane
Example sentences
The office had a wind vane, anemometer, and rain gage well exposed on the roof
  of the building.
The wind vane should be placed in an open area where it can rotate freely as
  the wind direction changes.
Our cup anemometer is partnered with a wind vane that adds the direction.
The wind direction is measured by our wind vane every second.
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