Curved or rounded outward, like the outside of a ball or a dome. Convex surfaces bulge out instead of bending inward.
From Latin *convexus* 'vaulted, arched', possibly from *con-* 'together' and *vehere* 'to carry' or a root meaning 'to bend'. It has long been used to describe rounded shapes in geometry and optics.
Convex is the 'belly out' shape, while concave is the 'cave in' shape—people mix them up all the time. One trick: 'cave' hides inside conCAVE, so that’s the one that curves inward. Convex lenses can make things look bigger because they bend light toward a focal point.
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