umbilication
/ʌmˌbɪlɪˈkeɪʃən/
noun
- The state or condition of having a small, central depression or dimple; a navel-like hollow.
- The umbilication of the mushroom cap helps identify the species.
- In some shells, umbilication is a key feature for classification.
- The doctor noted the umbilication of the rash, which suggested a specific infection.
Synonyms