landing flap

noun
a flap in the undersurface of the trailing edge of an aircraft wing, capable of being moved downward to increase either lift or drag or both, as for landing. Compare split flap ( def 1 ).

Origin:
1935–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
landing flap

noun
a flap on the underside of the wing that is lowered to slow the plane for landing 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Landing flap is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Example sentences
The design criterion is to select the landing flap setting that produces the shortest runway length.
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