concave on one side and convex on the other with the concavity being greater than the convexity
concavo-convex详细解释
con.ca.vo-con.vex adj.（形容词）Concave on one side and convex on the other.一面凹进一面凸起的Having greater curvature on the concave side than on the convex side. Used of a lens.凹凸的：凹面曲率大于凸面曲率的。用于指透镜
