arc; curved line
Refers to a curved line, especially a segment of a circle. Used in geometry, design, and general descriptions.
コンパスで弧線を描く。
Draw an arc with a compass.
このデザインには美しい弧線が使われている。
This design uses beautiful curved lines.
Compound of 弧 (arc) and 線 (line). The kanji 弧 originally refers to a wooden bow, extended to mean an arc.