From The Collaborative International Dictionary of English v.0.48 [gcide]:
Fillet \Fil"let\, v. t. [imp. & p. p. Filleted; p. pr. & vb.
n. Filleting.]
To bind, furnish, or adorn with a fillet.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]