 Fillet (picture framing)

In the picture framing industry, a fillet (also referred to as a slip) is a small piece of moulding which fits inside a larger frame or, typically, underneath or in between matting, used for decorative purposes.The picture framing term is probably related to, though not necessarily derived from, the engineering term, which it is frequently pronounced similarly to; however, unlike the use of fillets in mechanical engineering, the use of "fillets" in picture frames is wholly decorative.