Definitions

convexo-concave lens

Concave

[adj., v. kon-keyv, kon-keyv; n. kon-keyv]
The word concave means curving in or hollowed inward. The term is most commonly used to refer to:

In addition, the term concave upwards is used for convex functions, and concave downwards for concave functions.

See also

  • Convex — the opposite of concave.

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