垂线足 chuíxiànzú foot of a perpendicular Origin Definitions Defs Strokes Stroke Words Sentences Sents 垂线 垂線 chuíxiàn perpendicular line a line that is perpendicular or vertical to another line or plane; often used in mathematics足 zú noun base the lower part of an object that provides support, such as the legs of a tripod or cauldron