Guilloche

noun

1. An ornamental border formed of two or more curved bands that interlace to repeat a circular design.
2. To decorate with intersecting curved lines, or with any pattern composed of curved lines.
3. An ornamental pattern composed of intersecting curved lines, as the usual decoration of watch-cases; in architecture, an ornament in the form of two or more bands or ribbons interlacing or braided or twisted over each other so as to repeat the same figure in a continued series of spirals. The term is applied, but improperly, to a fret.
4. 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.
5. In ornamental art, any pattern made by interlacing curved lines.