wind vane

[wind]
noun

Origin:
1715–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
wind vane

noun
mechanical device attached to an elevated structure; rotates freely to show the direction of the wind [syn: weathervane
WordNet® 3.0, © 2006 by Princeton University.
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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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