Parts of windmills (5)

I believe the answer is:

vanes

(Other definitions for vanes that I've seen before include "Blades of a propellor or windmill sails" , "Weathercocks" , "Blades of a windmill or propeller" , "Blades of windmill or propellers" , "Blades of a windmill (5)" .)

I've seen this clue in The New York Times.

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