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windsock ['wɪndsɒk] n
avia., Canada	indicateur de direction du vent; manche à vent
English thesaurus
windsock ['wɪndsɒk] n
avia., Canada	An indicator that is in the form of a truncated cone made of fabric and that is not less than 12 ft long and, at the larger end, not less than 3 ft in diameter, so constructed as to give a clear indication of the direction of surface wind and a general indication of wind speed; An actuated device for indicating visually to aircraft the direction of surface wind