The Collaborative International Dictionary of English v.0.48:

Flitch \Flitch\, n.; pl. Flitches. [OE. flicche, flikke, AS.
   flicce, akin to Icel. flikki; cf. Icel. fl[imac]k flap,
   tatter; perh. akin to E. fleck. Cf. Flick, n.]
   1. The side of a hog salted and cured; a side of bacon.
      --Swift.
      [1913 Webster]

   2. One of several planks, smaller timbers, or iron plates,
      which are secured together, side by side, to make a large
      girder or built beam.
      [1913 Webster]

   3. The outside piece of a sawed log; a slab. [Eng.]
      [1913 Webster]