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weather vane

or weath·er·vane

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noun
  1. a device, as a rod to which a freely rotating pointer is attached, for indicating the direction of the wind.

Origin of weather vane

First recorded in 1715–25
Also called vane, wind vane.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for weather vane

weather vane

noun
  1. a vane designed to indicate the direction in which the wind is blowing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012