wind sock

windsock

[wind-sok]
noun
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.
Also, wind sock.
Also called air sleeve, air sock, wind cone, wind sleeve.


Origin:
1925–30; wind1 + sock1

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World English Dictionary
windsock (ˈwɪndˌsɒk)
 
n
air sock, drogue, wind sleeve, Also called: wind cone 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 direction

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