multifoil

Multifoil, or multi-foil, is a term used in several disciplines to describe a pattern or structure built from multiple foils—leaf-shaped lobes or blades—arranged around a central point or axis. The term is particularly common in architecture and decorative arts but also appears in engineering and design to denote multi-lobed or multi-blade configurations.

In architecture, multifoil describes arches, window tracery, or decorative motifs composed of several rounded lobes. Common variants include trefoil (three-lobed), quatrefoil (four-lobed), and cinquefoil (five-lobed). These forms are characteristic of medieval Gothic and later revival styles and are used to create visual rhythm and light within openings and façades.

In engineering and design, multifoil can refer to assemblies that incorporate several foil-shaped blades or sections in sequence to influence fluid flow, lift, or thrust. This includes multi-foil arrangements in propellers, turbines, or wing assemblies where the combination of multiple foils is intended to tailor performance characteristics.

In graphic design and ornamental work, multifoil patterns appear as repeated leaf-like motifs, borders, or tiling that derive their cadence from multiple foils arranged around a center or along a curve. The concept emphasizes multiplicity of leaf- or blade-shaped elements to produce symmetry and decorative richness.

Etymology stems from the word foil, meaning a blade or leaf, with multi- indicating plurality. Specific forms such as trefoil, quatrefoil, and cinquefoil are common named examples within the broad multifoil category.