wind·sock 
(wĭndsŏk′)
(wĭndsŏk′)n.
A large cone-shaped bag that is open at both ends and attached to a stand by a pivot to indicate the direction of the wind. Also called air sock, wind cone, wind sleeve.
windsock- decolorize
- decolorizer
- decommission
- decompensate
- decompensation
- decomposability
- decomposable
- decompose
- decomposer
- decomposition
- decompositional
- decompound
- decompound
- decompress
- decompression
- decompression chamber
- decompression sickness
- deconcentrate
- deconcentration
- decondition
- decongest
- decongestant
- decongestion
- decongestive
- deconsecrate