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.
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what does concave mean
[adj., v. kon-keyv, kon-keyv; n.kon-keyv]
curved like a segment of the interior of a circle or hollow sphere; hollow and curved.
Geometry (of a polygon) having at least one interior angle greater than 180°.