1. (a.) Concave on one side and convex on the other, as an eggshell or a crescent.
2. (a.) Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them.
| Concavo-convex 1. (a.) Concave on one side and convex on the other, as an eggshell or a crescent. 2. (a.) Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them. | |