What is anything which agitates the air as a wing does, or which is put in winglike motion by the action of the air, as a fan or vane for winnowing grain, the vane or sail of a windmill, etc called?

wing — Anything which agitates the air as a wing does, or which is put in winglike motion by the action of the air, as a fan or vane for winnowing grain, the vane or sail of a windmill, etc. (Webster's 1913.)

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