详细解释:【医】 心状的
英语解释：
名词 cardioid:
an epicycloid in which the rolling circle equals the fixed circle详细解释：
car.di.oid
n.（名词）A heart-shaped plane curve, the locus of a fixed point on a circle that rolls on the circumference of another circle with the same radius.心脏线：一种心形的平滑曲线，圆周上一固定点绕另一具有相同半径的圆的圆周转动的轨迹