CONCAVOCONVEX

Con*ca`vo-con"vex, a.

1. Concave on one side and convex on the other, as an eggshell or a crescent.

2. (Optics)

Definition: Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them. See Illust. under Lens.

Source: Webster’s Unabridged Dictionary 1913 Edition

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