A concave curvature or depression on a surface, particularly in geology or biology when describing bone or shell surfaces.
From Latin devexus, meaning sloped downward or curved inward. The term likely comes from de- (downward) + vexus (related to way or turning), reflecting its curved nature.
Paleontologists use 'devex' to describe subtle curves in fossil shells and bones—it's the opposite of 'convex,' but rarely heard outside of scientific literature. You'll encounter it in museum specimen descriptions and academic papers about extinct creatures.
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