concave

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concave

1. Physics having one or two surfaces curved or ground in the shape of a section of the interior of a sphere, paraboloid, etc.
2. Maths (of a polygon) containing an interior angle greater than 180°

concave

(kong-kayv , kong -kayv) Curving inward. A concave mirror converges light. A biconcave or planoconcave lens, thinner in the middle than at the edges, has a diverging action.

Concave

Forms that are curved like the inner surface of a hollow sphere or circular arc.

concave

[′kän‚kāv]
(science and technology)
Having a curved form which bulges inward resembling the interior of a sphere or cylinder or a section of these bodies.
References in periodicals archive ?
The molecule has a twisted banana shape with a characteristic convex and concave face.
With a narrow, slightly concave face and serrated edge, it replaces the trowel, weeder, and a range of other tools all in one fell swoop.
Many years later, there were claims Hess and his followers believed the earth to be hollow and we are all living inside its concave face, like ants crawling on the inner surface of a football.