Concave
Concave (Concavity) - Having an outline or surface curved like the interior surface of a bowl or sphere - to cave in or curve inward. For example, the internal surfaces of the pelvis are concave, holding some of the bodies viscera.
Concave
Concave (concavity) refers to a curve or outline that is curved inward, like the interior of a sphere or bowl. In anatomy, concave describes the surfaces of the body that are curved inwards, such as the pelvis that holds the internal organs.