1. 
[syn: windsock, wind sock, sock, air sock, air-sleeve, wind sleeve, wind cone, drogue]
WordNet (r) 3.0 (2006):
wind sock
    n 1: a truncated cloth cone mounted on a mast; used (e.g., at
         airports) to show the direction of the wind [syn:
         windsock, wind sock, sock, air sock, air-sleeve,
         wind sleeve, wind cone, drogue]
Moby Thesaurus II by Grady Ward, 1.0:
21 Moby Thesaurus words for "wind sock":
   anemograph, anemometer, anemometrograph, anemoscope, beacon, beam,
   cock, fan marker, flare path, marker, pylon, racon, radar beacon,
   radio beacon, vane, weather vane, weathercock, wind cone,
   wind indicator, wind vane, wind-speed indicator