convex

US /ˈkɑːn.veks/
UK /ˈkɑːn.veks/
"convex" picture
1.

凸的, 凸面

having an outline or surface curved like the exterior of a circle or sphere

:
The lens of the magnifying glass is convex.
放大镜的镜片是凸面的。
The surface of the mirror was slightly convex.
镜子的表面略微凸起