| a. | 1. | Concave on one side and convex on the other, as an eggshell or a crescent. |
| 2. | (Optics) Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them. See Illust. under Lens. |
| Adj. | 1. | concavo-convex - concave on one side and convex on the other with the concavity being greater than the convexity |
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