The mouth is relatively small, with a deep concavity at the center of the lower jaw and shallow furrows at the corners extending onto the lower jaw.

But the dig of most interest to me lies at its focus where a deep concavity is being unearthed.

The lunate bone (semilunar bone) is a carpal bone (wrist bone) in the human hand that may be distinguished by its deep concavity and crescentic outline.

The upper border is thin, and is surmounted by two processes, the coronoid in front and the condyloid behind, separated by a deep concavity, the mandibular notch.

Different kinds of the 1970s often have little or no concavity, whereas 1980s models have deeper concavities and steeper kicktails.

The posterior border of the lung is broad and rounded, and is received into the deep concavity on either side of the vertebral column.

With one fierce and skilful kick of his aching foot he will mend a deep concavity in the refrigerator's flank.

Its outer rim was shooting past the ship, which was now heading into the deep central concavity.

In the vertebrae, the neural canals (through which the spinal cord would pass) extend into the centra, forming deep concavities.

Head large, oviform, very distinct from neck; a strong rounded supraorbital and canthal ridge; five deep concavities, via.