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Flap

From Biology-Online Dictionary
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Flap

Anything broad and limber that hangs loose, or that is attached by one side or end and is easily moved; as, the flap of a garment. A cartilaginous flap upon the opening of the larynx. (Sir t. Browne)

2. A hinged leaf, as of a table or shutter.

3. The motion of anything broad and loose, or a stroke or sound made with it; as, the flap of a sail or of a wing.

4. (Science: veterinary) a disease in the lips of horses. Flap tile, a tile with a bent up portion, to turn a corner or catch a drip.

(Science: mechanics) flap valve, a valve which opens and shuts upon one hinged side; a clack valve.

Origin: oe. Flappe, flap, blow, bly-flap; cf. D. Flap, and E. Flap.