concavoconvex

listen to the pronunciation of concavoconvex
الإنجليزية - التركية
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الإنجليزية - الإنجليزية
Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them
under Lens
Concave on one side and convex on the other, as an eggshell or a crescent