What Does Concave Mean?

Answer

When we say that something is concave, we refer to the property of the item of having curved inwards. The term also refers to an element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting. Some of the concave things visible to us are like the vault of the sky and  the geocentric model of the world.
2 Additional Answers
Ask.com Answer for: what does concave mean
con·cave
[adj., v. kon-keyv, kon-keyv; n. kon-keyv]
ADJECTIVE
1.
curved like a segment of the interior of a circle or hollow sphere; hollow and curved.
2.
Geometry (of a polygon) having at least one interior angle greater than 180°.
3.
Obsolete hollow
NOUN
4.
a concave surface, part, line, or thing.
5.
Machinery a concave piece, as one against which a drum rotates.
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Source: Dictionary.com
Something is concave if it is curved inward. Bowls are concave and so are contact lenses for your eyes. They look like the inside of a sphere.
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