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 ?
Despite all of the hi-tech gadgetry available we still have to use equipment made in 1900s to get the degree of accuracy needed in matching concaves.
If a rock or other obstruction enters the threshing cylinder, the hydraulic cylinders holding the concaves in place automatically open to release the object.
And we have teamed up with Concave to offer one lucky reader the chance to win a pair of Concave boots signed by the footballing genius.
The revolutionary new Concave boots provide extra protection against the injury which has cursed a string of England stars, including David Beckham and Wayne Rooney.