The Collaborative International Dictionary of English v.0.48:

Slat \Slat\, n. [CF. Slot a bar.]
   A thin, narrow strip or bar of wood or metal; as, the slats
   of a window blind.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slat \Slat\, v. t. [imp. & p. p. Slatted; p. pr. & vb. n.
   Slatting.] [OE. slatten; cf. Icel. sletta to slap, to dab.]
   1. To slap; to strike; to beat; to throw down violently.
      [Prov. Eng. & Colloq. U.S.]
      [1913 Webster]

            How did you kill him?
            Slat[t]ed his brains out.             --Marston.
      [1913 Webster]

   2. To split; to crack. [Prov. Eng.] --Halliwell.
      [1913 Webster]

   3. To set on; to incite. See 3d Slate. [Prov. Eng.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

slat
    n 1: a thin strip (wood or metal) [syn: slat, spline]
    v 1: equip or bar with slats; "Slat the windows"
    2: close the slats of (windows)