umbilicus
noun /ʌmˈbɪlɪkəs/,  /ˌʌmbɪˈlaɪkəs/
  /ʌmˈbɪlɪkəs/,  /ˌʌmbɪˈlaɪkəs/
(plural umbilici 
 (specialist) /ʌmˈbɪlɪsaɪ/,  /ʌmˈbɪlɪkaɪ/,  /ˌʌmbɪˈlaɪsaɪ/,  /ˌʌmbɪˈlaɪkaɪ/
  /ʌmˈbɪlɪsaɪ/,  /ʌmˈbɪlɪkaɪ/,  /ˌʌmbɪˈlaɪsaɪ/,  /ˌʌmbɪˈlaɪkaɪ/
, umbilicuses)- the navelWord Originlate 17th cent.: from Latin: related to Greek omphalos, also to navel.