平分线 píngfēnxiàn bisector Origin Definitions Defs Strokes Stroke Words Sentences Sents 垂直平分线 chuízhípíngfēnxiàn perpendicular bisector A line that is perpendicular to a line segment and passes through its midpoint; midnormal角平分线 jiǎopíngfēnxiàn angle bisector A straight line that divides an angle into two equal parts.