Back in the day, a flitch was usually the tenderloin of the log which was sold to cabinetmakers, who resawed it to make boards. Ole' Reino, who ran a mill near my property considered a flitch as pretty much slabbing all four sides of a venneer log and selling it to small shops when the veneer logs weren't selling for any decent money. The small shops could quarter it, or slice it, or whatever, but usually laboriously bandsawed it into veneers and made really pretty stuff from it. Reino told me about an 18' maple log he sold as a flitch which ended up pretty much covering the interior of a lounge in the U.P., I was there once with my Pop, and it was purty. Wish I could remember the name of the place!!! Somewhere around Marquette.........