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.
During measurements at quiescent volcanoes, plumes are seldom visible for use as a directional windsock.
The windsock located on the east side of the airport was replaced.
British Dictionary definitions for windsock
windsock
/ˈwɪndˌsɒk/
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 direction Also called air sock, drogue, wind sleeve, wind cone