convex

Short definition from Wiktionary

Adjective

1. 1
   Curved or bowed outward like the outside of a bowl, circle, or sphere.
2. 2
   having an epigraph that is a convex set.
3. 3
   having no internal angles greater than 180 degrees.
4. 4
   arranged such that for any two points in the set, a straight line between the two points is contained within the set.

Noun

1. 1
   Any convex body or surface.
2. 2
   A playing card made convex for use in cheating.
3. 3
   A small convex mirror used to cheat by observing other players' cards.

Verb

1. 1
   To form a convex curve or surface; to become convex.
2. 2
   To cause to form a convex curve or surface; to make convex.
3. 3
   To circulate or cause to circulate in a curved path; to cause or exhibit convection.