umbilicus

 
Pronunciation: /ʌmˈbɪlɪkəs, ˌʌmbɪˈlʌɪkəs/

noun (plural umbilici /-sʌɪ/ or umbilicuses)

  • 1 Anatomy the navel.
  • 2 Zoology a depression or hole at the centre of the shell whorls of some gastropod molluscs and many ammonites.
  • a hole at each end of the hollow shaft of a feather.

Origin:

late 17th century: from Latin: related to Greek omphalos, also to navel