guilloche

‖n. [ F. guillochis; -- said to be fr. Guillot, the inventor of a machine for carving it. ] (Arch.) 1. An ornament in the form of two or more bands or strings twisted over each other in a continued series, leaving circular openings which are filled with round ornaments. [ 1913 Webster ]

2. In ornamental art, any pattern made by interlacing curved lines. [ Webster 1913 Suppl. ]