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windsock

or wind sock

[wind-sok]
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noun
  1. a tapered, tubular cloth vane, open at both ends and having at the larger end a fixed ring pivoted to swing freely, installed at airports or elsewhere to indicate wind direction and approximate intensity.
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Origin of windsock

First recorded in 1925–30; wind1 + sock1
Also called air sleeve, air sock, wind cone, wind sleeve.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for windsock

windsock

noun
  1. a truncated cone of textile mounted on a mast so that it is free to rotate about a vertical axis: used, esp at airports, to indicate the local wind directionAlso called: air sock, drogue, wind sleeve, wind cone
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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

Word Origin and History for windsock

n.

1929, from wind (n.1) + sock (n.).

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Online Etymology Dictionary, © 2010 Douglas Harper