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Opposite of concave . A geometric shape is convex if all its edges point outwards. That is no part of it curves or faces inwards. If a shape is convex, a line segment drawn between any two points on the shape will always lie inside the shape. The figure above is a convex pentagon. No part of it is caved in and any line segment, such as the red one shown, linking two points on it always lies inside the shape. See also Concave definition.
A lens that is concave on one side and convex on the other. 2. The curved upper surface of a column of liquid. The surface is concave if the molecules of the liquid are attracted to the container walls and convex if they are not. 3. A piece of cartilage shaped like a crescent and located at the junction of two bones in a joint, such as the knee.