Fillet \Fil"let\, v. t. [imp. & p. p. {Filleted}; p. pr. & vb. n. {Filleting}.] To bind, furnish, or adorn with a fillet. 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. 2. The material of which fillets are made; also, fillets, collectively.