公垂线 gōngchuíxiàn common perpendicular Origin Definitions Defs Strokes Stroke Words Sentences Sents 公 gōng nounadjective public belonging to the state, community, or public; collectively owned as opposed to private; shared by all垂线 垂線 chuíxiàn perpendicular line a line that is perpendicular or vertical to another line or plane; often used in mathematics