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wind direction indicator
sciences., techn.	indicatore della direzione del vento
Anglais glossaire
Wind Direction Indicator
météor., abrév.	WDI
wind direction indicator
aviat., canad.	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