A flame-bladed sword or wave-bladed sword has a characteristically undulating style of blade. The wave in the blade is often considered to contribute a flame-like quality to the appearance of a sword. It is sometimes termed flamberge, meaning "flame blade".
While largely decorative, some attributes of the waved blade were useful in combat. Parrying with such a sword may transmit unpleasant vibrations into the attacker's blade. These vibrations caused the blades to slow contact with each other because each wave provided additional friction. The unusual cross section of the blade would inflict wider wounds with a thrust while still keeping the blade light.