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1 definition found
 for Flap valve
From The Collaborative International Dictionary of English v.0.48 :

  Flap \Flap\, n. [OE. flappe, flap, blow, bly-flap; cf. D. flap,
     and E. flap, v.]
     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.
     [1913 Webster]
  
           A cartilaginous flap upon the opening of the larynx.
                                                    --Sir T.
                                                    Browne.
     [1913 Webster]
  
     2. A hinged leaf, as of a table or shutter.
        [1913 Webster]
  
     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.
        [1913 Webster]
  
     4. pl. (Far.) A disease in the lips of horses.
        [1913 Webster]
  
     5. (Aeronautics) a movable part of an airplane wing, used to
        increase lift or drag, especially when taking off or
        landing. used often in the plural.
        [WordNet 1.5]
  
     Flap tile, a tile with a bent up portion, to turn a corner
        or catch a drip.
  
     Flap valve (Mech.), a valve which opens and shuts upon one
        hinged side; a clack valve.
        [1913 Webster]

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