Concave

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Concave

Property that a curve is below a straight line connecting two end points. If the curve falls above the straight line, it is called convex.

Concave

Describing a curve segment whose ends fall below an arbitrarily set straight line. Concave properties are important to charting; for example, when tracking a stock market's performance, a dip in the chart with respect to the previous day's close followed by a rally going up to but not necessarily meeting that close may be described as a concave curve.
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Air and automatic machines available with 40-digit steel-engraved index wheels, flat or concave face. Also supplies steel and brass concave or flat-face type and roll leaf.
The stretched fibers on the convex face tend to fracture long before the compressed concave face reaches maximum stress limits.
Its concave face catches and throws water on the retrieve, same as 4%-inch big brother, Chug 'N Spook.