The Collaborative International Dictionary of English v.0.48:

Filleting \Fil"let*ing\, n.
   1. (Arch.) The protecting of a joint, as between roof and
      parapet wall, with mortar, or cement, where flashing is
      employed in better work.
      [1913 Webster]

   2. The material of which fillets are made; also, fillets,
      collectively.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fillet \Fil"let\, v. t. [imp. & p. p. Filleted; p. pr. & vb.
   n. Filleting.]
   To bind, furnish, or adorn with a fillet.
   [1913 Webster]