umbilicus


Concise Oxford English Dictionary © 2008 Oxford University Press:
umbilicus /ʌmˈbɪlɪkəs, ˌʌmbɪˈlʌɪkəs/
noun (pl. umbilici /-sʌɪ/ or umbilicuses)
  • 1 Anatomy the navel.
  • 2 Zoology a central depression or hole in the whorl of some gastropod molluscs and many ammonites.
  • 3 Zoology a hole at each end of the hollow shaft of a feather.
– origin C17: from L.: rel. to Gk omphalos, also to navel.
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