切向量 qièxiàngliàng tangent vector Origin Definitions Defs Strokes Stroke Words Sentences Sents 切 qiē tangent (math) to be tangential to; to touch a curve or surface at a single point向量 xiàngliàng vector (math) a quantity having direction as well as magnitude, such as force or velocity; also called 矢量 shǐliàng