详细解释:a. 外消旋的
【医】 总状花的, [外]消旋的
详细解释：
ra.ce.mic
adj.（形容词）Of or relating to a chemical compound that contains equal quantities of dextrorotatory and levorotatory forms and therefore does not rotate the plane of incident polarized light.外消旋的：属于或关于一种化合物的，该化合物由等量的左旋和右旋形式组成，因而对偏振光平面不旋光