umbilicus
US /ʌmˈbɪl.ə.kəs/
UK /ʌmˈbɪl.ə.kəs/
1.
lỗ rốn
the small, round part in the middle of the belly that is left after the umbilical cord (= the long tube of flesh joining the baby to its mother) has been cut at birth:
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Unlike other mammals, the human umbilicus is clearly visible.