nose flap

leading-edge flap

leading-edge flapclick for a larger image
Leading-edge flaps.
A portion of the leading edge of the wing that folds downward to increase the camber of the wing to increase both its lift and its drag. Leading-edge flaps are used both for takeoff and landing. See also Krüger flap. Also called a nose flap.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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Another option available to cattle producers is plastic nose flaps that can be used to prevent the calf from suckling while it is still with the cow.
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And why the funny nose flaps? They may pick up vibrations in the water made by small fish.