umbilications
/ˌʌmbɪlɪˈkeɪʃənz/
noun
- The condition or process of having a navel or navel-like depression.
- The doctor noted the normal umbilications of the newborn's abdomen.
- The artist sculpted subtle umbilications into the clay bowl's surface.
- In some seashells, umbilications form a spiral groove at the base.