adjective
convex
KON-veks/ˈkɑːnveks/
Curving outward like the outside of a ball.
The lens has a convex surface that bulges outward at the middle.
Etymology
The “carry together” image may refer to vaults meeting at a roof's high point. Latin used the resulting word for “vaulted” or “arched,” leading to the outward-curving sense.
In context
a gentle convex swelling to the profile of the column, which prevents an optical illusion of concavity
More examples
- The back of a spoon is convex.
- This magnifying glass has two convex surfaces.
- The watch has a convex glass cover.
Forms
convexity noun — The quality of curving or bulging outward.