Concavo-convex
(a.) Concave on one side and convex on the other, as an eggshell or a crescent.
(a.) Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them. See Illust. under Lens.
Similar Words:
Biconcave Concamerate Concameration Concatenate Concatenated Concatenating Concatenation Concause Concavation Concave