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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Upon immersion in liquids, the membranes responded to trapped radical reactions associated with solvent-polymer interactions and to differences in expansion between the support and the plasma film, by bending concavely with respect to the film.
Platinum & diamond "Sun" necklace (a shower of 19 platinum suns with rays of concavely set solitaire diamonds, 59 carats) with platinum & diamond star stud earrings.
if the bottom veneer was only half as thick as the top veneer, it would not restrain the core as effectively and the panel would warp concavely upwards.