noun. The state of being curved like the inner surface of a sphere.

noun. A surface or structure configured in such a curve.

noun. The state of being concave; hollowness.

noun. A concave surface, or the space contained in it; the internal surface of a hollow curved body, or the space within such body; any hollow space which is more or less spherical.

noun. A concave surface, or the space bounded by it; the state of being concave.

noun. The state of being concave

noun. A concave structure or surface

noun. the property possessed by a concave shape

noun. a shape that curves or bends inward

"The central part of the posterior surface presents a deep concavity which is moulded on the vertebral column and crura of the diaphragm."

convexity  

acclivity  autochef  autocorrelation  conjoin  death-trap  

aduncity  alveolation  alveolus  antrum  aquilinity