umbilicate
/ʌmˈbɪlɪkɪt/
adjective
- Having a small, central depression or dimple, like a navel.
- Some seashells are umbilicate, with a small opening at the base.
- The botanist noted that the leaf was umbilicate, with a distinct dimple.
- The mushroom had an umbilicate cap with a tiny hollow in the center.