from The Century Dictionary.
- noun A file used to trim up the outer edges of the cutting-teeth of saws after setting.
Sorry, no etymologies found.
This is why it is more important to keep formats and protocols, small, modular and relatively orthogonal, rather than trying to cram everything into a yet another side-file, especially one that unnecessarily reinvents vocabulary rather than reusing highly interoperable vocabulary (e.g. vCard).