弧こ線せんこせんMeanings1nounarc; curved lineRefers to a curved line, especially a segment of a circle. Used in geometry, design, and general descriptions.コンパスで弧こ線せんを描えがく。Draw an arc with a compass.このデザインには美うつくしい弧こ線せんが使つかわれている。This design uses beautiful curved lines.