The Chinese word **半径 (bànjìng)**, meaning "radius," is a straightforward compound formed by combining two meaningful characters: **半 (bàn)**, meaning "half," and **径 (jìng)**, which in a mathematical context means "diameter" or "straight path." The term is therefore formed logically through semantic composition, where "half" (半) of a "diameter" (径) directly and intuitively describes the geometric concept of a radius—the distance from the center of a circle to its circumference.