Any convex body or surface.
A playing card made convex for use in cheating.
A small convex mirror used to cheat by observing other players' cards.
arranged such that for any two points in the set, a straight line between the two points is contained within the set.
Curved or bowed outward like the outside of a bowl, circle, or sphere.
having no internal angles greater than 180 degrees.
having an epigraph that is a convex set.
A crease, wrinkle, or irregular fold.
To rumple; to press into wrinkles by crushing together.
To become wrinkled.
To collapse.
To cause to collapse.