Concave
English Meaning
Hollow and curved or rounded; vaulted; -- said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to convex; as, a concave mirror; the concave arch of the sky.
- Curved like the inner surface of a sphere.
- A concave surface, structure, or line.
- To make concave.