convex

The bottle has an unusual convex base, meaning it cannot stand upright, and it is made of coarse glass, full of tiny air bubbles.

On a convex or tubular structure such as the outside surface of a blood vessel, cells tend to move circumferentially around the shape.

The most aggressively three-dimensional entries are by Graham Caldwell, who mounts multiple glass objects, such as transparent orbs or convex mirrors, on black metal armatures that jut from the wall.

Some of the houses have facades that are either concave or convex, depending on what side of the street they’re on.

Mr. Irwin walked into his studio one day in the mid-1960s, looking for help building a curved, convex armature for his canvas dot paintings.